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<H5 align="left" style="page-break-before:always"><A HREF="#toc">Table of Contents</A></H5><P>
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<DIV style="width: 100%; border-bottom: 2pt solid black; font-size: 1pt">&nbsp;</DIV>
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<DIV align="center" style="font-size: 14pt; margin-top: 12pt"><B>UNITED STATES<BR>
SECURITIES AND EXCHANGE COMMISSION</B>
</DIV>

<DIV align="center" style="font-size: 12pt"><B>WASHINGTON, D.C. 20549</B>
</DIV>

<DIV align="center" style="font-size: 10pt; margin-top: 12pt"><DIV align="center"><DIV style="FONT-size: 3pt; margin-top: 16pt; width: 26%; border-top: 1px solid #000000">&nbsp;</DIV></DIV></DIV>

<DIV align="center" style="font-size: 18pt; margin-top: 12pt"><B>FORM S-8</B>
</DIV>


<DIV align="center" style="font-size: 12pt; margin-top: 12pt"><B>REGISTRATION STATEMENT<BR>
UNDER<BR>
THE SECURITIES ACT OF 1933</B>
</DIV>

<DIV align="center" style="font-size: 10pt; margin-top: 12pt"><DIV align="center"><DIV style="FONT-size: 3pt; margin-top: 16pt; width: 26%; border-top: 1px solid #000000">&nbsp;</DIV></DIV></DIV>

<DIV align="center" style="font-size: 24pt; margin-top: 12pt"><B>CoreSite Realty Corporation</B>
</DIV>

<DIV align="center" style="font-size: 10pt">(Exact name of registrant as specified in its charter)</DIV>


<DIV align="center">
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<TR valign="bottom">
    <TD align="center" valign="top"><B>Maryland</B><BR>
(State or other jurisdiction of <BR>
incorporation or organization)
</TD>
    <TD>&nbsp;</TD>
    <TD align="center" valign="top"><B>27-1925611</B><BR>
(I.R.S. Employer<BR>
Identification No.)</TD>
</TR>
<!-- End Table Body -->
</TABLE>
</DIV>

<DIV align="center" style="font-size: 10pt; margin-top: 12pt"><DIV align="center"><DIV style="FONT-size: 3pt; margin-top: 16pt; width: 26%; border-top: 1px solid #000000">&nbsp;</DIV></DIV></DIV>

<DIV align="center" style="font-size: 10pt; margin-top: 12pt"><B>1050 17</B><SUP style="FONT-size: 85%; vertical-align: text-top"><B>th</b></SUP> <b>Street, Suite&nbsp;800<BR>
Denver, CO 80265</B><BR>
(Address of Principal Executive Offices)</DIV>

<DIV align="center" style="font-size: 10pt; margin-top: 12pt"><DIV align="center"><DIV style="FONT-size: 3pt; margin-top: 16pt; width: 26%; border-top: 1px solid #000000">&nbsp;</DIV></DIV></DIV>

<DIV align="center" style="font-size: 10pt; margin-top: 12pt"><B>CORESITE REALTY CORPORATION AND CORESITE, L.P.<BR>
2010 EQUITY INCENTIVE AWARD PLAN</B></DIV>

<DIV align="center" style="font-size: 10pt; margin-top: 0pt">(Full title of the plan)</DIV>

<DIV align="center" style="font-size: 10pt"><DIV align="center"><DIV style="FONT-size: 1pt; margin-top: 12pt; width: 26%; border-top: 1px solid #000000">&nbsp;</DIV></DIV></DIV>


<DIV align="center" style="font-size: 10pt; margin-top: 0pt"><B>Thomas M. Ray<BR>
President &#038; Chief Executive Officer<BR>
CoreSite Realty Corporation<BR>
1050 17</B><SUP style="FONT-size: 85%; vertical-align: text-top"><B>th</b></SUP><b> Street, Suite&nbsp;800<BR>
Denver, CO 80265</B><BR>
(Name and address of agent for service)<BR>
<B>(866)&nbsp;777-2673</B><BR>
(Telephone number, including area code, of agent for service)</DIV>

<DIV align="center" style="font-size: 10pt; margin-top: 12pt"><DIV align="center"><DIV style="FONT-size: 3pt; margin-top: 16pt; width: 26%; border-top: 1px solid #000000">&nbsp;</DIV></DIV></DIV>

<DIV align="center" style="font-size: 10pt; margin-top: 12pt"><I>Copies to:</I><BR>
<B>Raymond Y. Lin<BR>
Patrick H. Shannon<BR>
Latham &#038; Watkins LLP<BR>
885 Third Avenue<BR>
New York, New York 10022<BR>
(212)&nbsp;906-1200</B></DIV>

<DIV align="center" style="font-size: 10pt; margin-top: 12pt"><DIV align="center"><DIV style="FONT-size: 3pt; margin-top: 16pt; width: 26%; border-top: 1px solid #000000">&nbsp;</DIV></DIV></DIV>


<DIV align="left" style="font-size: 10pt; margin-top: 6pt">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Indicate by check mark whether the registrant is a large accelerated filer, an accelerated
filer, a non-accelerated filer, or a smaller reporting company. See the definitions of &#147;large
accelerated filer,&#148; &#147;accelerated filer&#148; and &#147;smaller reporting company&#148; in Rule&nbsp;12b-2 of the
Exchange Act.
</DIV>
<DIV align="center">
<TABLE style="font-size: 10pt" cellspacing="0" border="0" cellpadding="0" width="100%">
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    <TD width="22%">&nbsp;</TD>
    <TD width="3%">&nbsp;</TD>
    <TD width="22%">&nbsp;</TD>
    <TD width="3%">&nbsp;</TD>
    <TD width="22%">&nbsp;</TD>
    <TD width="3%">&nbsp;</TD>
    <TD width="22%">&nbsp;</TD>
</TR>
<TR></TR>
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<TR valign="bottom">
    <TD align="center" valign="top"><FONT style="white-space: nowrap">Large accelerated filer <FONT style="font-family: Wingdings">&#111;</FONT></FONT>
</TD>
    <TD>&nbsp;</TD>
    <TD align="center" valign="top"><FONT style="white-space: nowrap">Accelerated filer <FONT style="font-family: Wingdings">&#111;</FONT></FONT>
</TD>
    <TD>&nbsp;</TD>
    <TD align="center" valign="top"><FONT style="white-space: nowrap">Non-accelerated filer <FONT style="font-family: Wingdings">&#254;</FONT></FONT>
</TD>
    <TD>&nbsp;</TD>
    <TD align="center" valign="top"><FONT style="white-space: nowrap">Smaller reporting company <FONT style="font-family: Wingdings">&#111;</FONT></FONT></TD>
</TR>
<TR valign="bottom">
    <TD align="center" valign="top">&nbsp;
</TD>
    <TD>&nbsp;</TD>
    <TD align="center" valign="top">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="center" valign="top"><FONT style="white-space: nowrap">(do not check if a smaller reporting company)</FONT></TD>
    <TD>&nbsp;</TD>
    <TD align="center" valign="top">&nbsp;</TD>
</TR>
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</TABLE>
</DIV>

<DIV align="center" style="font-size: 10pt; margin-top: 12pt"><B>CALCULATION OF REGISTRATION FEE</B></DIV>

<DIV align="center">
<TABLE style="font-size: 10pt" cellspacing="0" border="0" cellpadding="0" width="100%">
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<TR valign="bottom">
    <TD width="1%">&nbsp;</TD>
    <TD width="45%">&nbsp;</TD>
    <TD width="1%">&nbsp;</TD><!-- VRule -->
    <TD width="1%">&nbsp;</TD>
    <TD width="16%">&nbsp;</TD>
    <TD width="1%">&nbsp;</TD><!-- VRule -->
    <TD width="1%">&nbsp;</TD>
    <TD width="5%">&nbsp;</TD>
    <TD width="1%">&nbsp;</TD><!-- VRule -->
    <TD width="1%">&nbsp;</TD>
    <TD width="15%">&nbsp;</TD>
    <TD width="1%">&nbsp;</TD><!-- VRule -->
    <TD width="1%">&nbsp;</TD>
    <TD width="9%">&nbsp;</TD>

    <TD width="1%">&nbsp;</TD>
</TR><TR style="font-size: 1px" valign="bottom">
    <TD nowrap align="left" colspan="15" style="border-bottom: 3px double #000000">&nbsp;</TD>
</TR>
<TR style="font-size: 8pt" valign="bottom">    <TD width="1%">&nbsp;</TD>

    <TD>&nbsp;</TD>
    <TD style="border-right: 2px solid #000000">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD style="border-right: 2px solid #000000">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD style="border-right: 2px solid #000000">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD nowrap align="center"><B>Proposed maximum</B></TD>
    <TD style="border-right: 2px solid #000000">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD nowrap align="center">&nbsp;</TD>
    <TD width="1%">&nbsp;</TD>
</TR>
<TR style="font-size: 8pt" valign="bottom">    <TD width="1%">&nbsp;</TD>

    <TD>&nbsp;</TD>
    <TD style="border-right: 2px solid #000000">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD nowrap align="center"><B>Amount</B></TD>
    <TD style="border-right: 2px solid #000000">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD nowrap align="center"><B>Proposed maximum</B></TD>
    <TD style="border-right: 2px solid #000000">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD nowrap align="center"><B>aggregate</B></TD>
    <TD style="border-right: 2px solid #000000">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD nowrap align="center"><B>Amount of</B></TD>
    <TD width="1%">&nbsp;</TD>
</TR>
<TR style="font-size: 8pt" valign="bottom">    <TD width="1%">&nbsp;</TD>

    <TD>&nbsp;</TD>
    <TD style="border-right: 2px solid #000000">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD nowrap align="center"><B>to be</B></TD>
    <TD style="border-right: 2px solid #000000">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD nowrap align="center"><B>offering price</B></TD>
    <TD style="border-right: 2px solid #000000">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD nowrap align="center"><B>offering</B></TD>
    <TD style="border-right: 2px solid #000000">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD nowrap align="center"><B>registration</B></TD>
    <TD width="1%">&nbsp;</TD>
</TR>
<TR style="font-size: 8pt" valign="bottom">    <TD width="1%">&nbsp;</TD>

    <TD nowrap align="center"><B>Title of securities to be registered</B></TD>
    <TD style="border-right: 2px solid #000000">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD nowrap align="center"><B>registered (1)</B></TD>
    <TD style="border-right: 2px solid #000000">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD nowrap align="center"><B>per share (2)</B></TD>
    <TD style="border-right: 2px solid #000000">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD nowrap align="center"><B>price (2)</B></TD>
    <TD style="border-right: 2px solid #000000">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD nowrap align="center"><B>fee</B></TD>
    <TD width="1%">&nbsp;</TD>
</TR>

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<TR valign="bottom">
    <TD width="1%" style="border-top: 2px solid #000000">&nbsp;</TD>
                    <TD style="border-top: 2px solid #000000"><DIV style="margin-left:15px; text-indent:-15px">Common Stock, par value $0.01 per share</DIV></TD>
    <TD style="border-right: 2px solid #000000; border-top: 2px solid #000000">&nbsp;</TD>
    <TD style="border-top: 2px solid #000000">&nbsp;</TD>
    <TD align="center" valign="bottom" style="border-top: 2px solid #000000">3,000,000 Shares</TD>
    <TD style="border-right: 2px solid #000000; border-top: 2px solid #000000">&nbsp;</TD>
    <TD style="border-top: 2px solid #000000">&nbsp;</TD>
    <TD align="center" valign="bottom" style="border-top: 2px solid #000000">$16.01</TD>
    <TD style="border-right: 2px solid #000000; border-top: 2px solid #000000">&nbsp;</TD>
    <TD style="border-top: 2px solid #000000">&nbsp;</TD>
    <TD align="center" valign="bottom" style="border-top: 2px solid #000000">$48,030,000.00</TD>
    <TD style="border-right: 2px solid #000000; border-top: 2px solid #000000">&nbsp;</TD>
    <TD style="border-top: 2px solid #000000">&nbsp;</TD>
    <TD align="center" valign="bottom" style="border-top: 2px solid #000000">$3,424.54</TD>
    <TD width="1%" style="border-top: 2px solid #000000">&nbsp;</TD>
</TR>
<TR style="font-size: 1px" valign="bottom">
    <TD nowrap align="left" colspan="15" style="border-top: 3px double #000000">&nbsp;</TD>
</TR>

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</TABLE>
</DIV>

<DIV align="left">
<DIV style="font-size: 3pt; margin-top: 3pt; width: 18%; border-top: 0px solid #000000">&nbsp;</DIV>
</DIV>


<TABLE width="100%" border="0" cellpadding="0" cellspacing="0" style="font-size: 10pt">
<TR>
    <TD width="3%"></TD>
    <TD width="1%"></TD>
    <TD width="96"></TD>
</TR>

<TR valign="top">
    <TD nowrap align="left">(1)</TD>
    <TD>&nbsp;</TD>
    <TD>Pursuant to Rule&nbsp;416 under the Securities Act of 1933, as amended, this Registration
Statement shall also cover any additional shares of common stock that become issuable under
the above-named plan by reason of any stock dividend, stock split, recapitalization or any
other similar transaction effected without the receipt of consideration that results in an
increase in the number of the Registrant&#146;s outstanding shares of common stock.</TD>
</TR>

<TR style="font-size: 3pt"><TD>&nbsp;</TD></TR>

<TR valign="top">
    <TD nowrap align="left">(2)</TD>
    <TD>&nbsp;</TD>
    <TD>Estimated solely for purposes of calculating the registration fee pursuant to Rules
457(c) and (h)&nbsp;of the Securities Act of 1933. The proposed maximum offering price per share,
proposed maximum aggregate offering price and the amount of the registration fee are based on
the average of the high and low prices for the common stock as reported on the New York Stock
Exchange on September&nbsp;23, 2010.</TD>
</TR>

</TABLE>


<DIV align="center" style="font-size: 10pt; margin-top: 12pt"><B>Proposed sales to take place as soon after the effective date of this Registration Statement as awards granted<BR>
under the above-named plan are granted, exercised and/or distributed.</B></DIV>


<DIV style="width: 100%; border-bottom: 1pt solid black; margin-top: 10pt; font-size: 1pt">&nbsp;</DIV>
<DIV style="width: 100%; border-bottom: 2pt solid black; font-size: 1pt">&nbsp;</DIV>
















<P align="center" style="font-size: 10pt"><!-- Folio --><!-- /Folio -->
</DIV>



<!-- PAGEBREAK -->
<P><HR noshade><P>
<DIV style="font-family: 'Times New Roman',Times,serif">

<!-- TOC -->
<A name="toc"><DIV align="CENTER" style="page-break-before:always"><U><B>TABLE OF CONTENTS</B></U></DIV></A>

<P><CENTER>
<TABLE border="0" width="90%" cellpadding="0" cellspacing="0">
<TR>
	<TD width="3%"></TD>
	<TD width="3%"></TD>
	<TD width="3%"></TD>
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	<TD width="3%"></TD>
	<TD width="3%"></TD>
	<TD width="76%"></TD>
</TR>
<TR><TD colspan="9"><A HREF="#000">PART I</A></TD></TR>
<TR><TD></TD><TD colspan="8"><A HREF="#001">Item&nbsp;1. Plan Information</A></TD></TR>
<TR><TD></TD><TD colspan="8"><A HREF="#002">Item&nbsp;2. Registrant Information and Employee Plan Annual Information</A></TD></TR>
<TR><TD colspan="9"><A HREF="#003">PART II</A></TD></TR>
<TR><TD></TD><TD colspan="8"><A HREF="#004">Item&nbsp;3. Incorporation of Documents by Reference</A></TD></TR>
<TR><TD></TD><TD colspan="8"><A HREF="#005">Item&nbsp;4. Description of Securities</A></TD></TR>
<TR><TD></TD><TD colspan="8"><A HREF="#006">Item&nbsp;5. Interests of Named Experts and Counsel</A></TD></TR>
<TR><TD></TD><TD colspan="8"><A HREF="#007">Item&nbsp;6. Indemnification of Directors and Officers</A></TD></TR>
<TR><TD></TD><TD colspan="8"><A HREF="#008">Item&nbsp;7. Exemption From Registration Claimed</A></TD></TR>
<TR><TD></TD><TD colspan="8"><A HREF="#009">Item&nbsp;8. Exhibits</A></TD></TR>
<TR><TD></TD><TD colspan="8"><A HREF="#010">Item&nbsp;9. Undertakings</A></TD></TR>
<TR><TD colspan="9"><A HREF="#011"> SIGNATURES</A></TD></TR>
<TR><TD colspan="9"><A HREF="#012">EXHIBIT INDEX</A></TD></TR>
<TR><TD colspan="9"><A HREF="d76472exv5w1.htm">EX-5.1</A></TD></TR>
<TR><TD colspan="9"><A HREF="d76472exv23w1.htm">EX-23.1</A></TD></TR>
</TABLE>
</CENTER>
<!-- /TOC -->
<P><HR noshade><P>
<H5 align="left" style="page-break-before:always"><A HREF="#toc">Table of Contents</A></H5><P>


<!-- link1 "PART I" -->
<DIV align="left"><A NAME="000"></A></DIV>

<DIV align="center" style="font-size: 10pt; margin-top: 18pt"><B>PART I</B>
</DIV>


<DIV align="center" style="font-size: 10pt; margin-top: 6pt"><B>INFORMATION REQUIRED IN THE SECTION 10(a) PROSPECTUS</B>
</DIV>

<!-- link2 "Item&nbsp;1. Plan Information" -->
<DIV align="left"><A NAME="001"></A></DIV>

<DIV align="left" style="font-size: 10pt; margin-top: 12pt"><B>Item&nbsp;1. Plan Information.</B>
</DIV>


<DIV align="left" style="font-size: 10pt; margin-top: 6pt">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Not required to be filed with this Registration Statement.*
</DIV>
<!-- link2 "Item&nbsp;2. Registrant Information and Employee Plan Annual Information" -->
<DIV align="left"><A NAME="002"></A></DIV>

<DIV align="left" style="font-size: 10pt; margin-top: 12pt"><B>Item&nbsp;2. Registrant Information and Employee Plan Annual Information.</B>
</DIV>


<DIV align="left" style="font-size: 10pt; margin-top: 6pt">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Not required to be filed with this Registration Statement.*
</DIV>



<DIV align="left">
<DIV style="font-size: 3pt; margin-top: 16pt; width: 18%; border-top: 1px solid #000000">&nbsp;</DIV>
</DIV>


<TABLE width="100%" border="0" cellpadding="0" cellspacing="0" style="font-size: 10pt; font-family: 'Times New Roman', Times; color: #000000; background: #FFFFFF">

<TR>
    <TD width="3%"></TD>
    <TD width="1%"></TD>
    <TD width="96%"></TD>
</TR>

<TR>
    <TD valign="top">*</TD>
    <TD>&nbsp;</TD>
    <TD valign="bottom">

<DIV align="left" style="font-size: 10pt; margin-top: 6pt">The documents containing the information specified in this Part&nbsp;I will be sent or given to
participants in the CoreSite Realty Corporation&#146;s (the &#147;Registrant&#148;) 2010 Equity Incentive Award
Plan, as specified by Rule&nbsp;428(b)(1) under the Securities Act of 1933, as amended (the &#147;Securities
Act&#148;). In accordance with Rule&nbsp;428 of the Securities Act and the requirements of Part&nbsp;I of Form
S-8, such documents need not be filed with the Securities and Exchange Commission (the
&#147;Commission&#148;) either as part of this Registration Statement or as prospectuses or prospectus
supplements pursuant to Rule&nbsp;424 promulgated under the Securities Act. These documents and the
documents incorporated by reference in this Registration Statement pursuant to Item&nbsp;3 of Part&nbsp;II
hereof, taken together, constitute a prospectus that meets the requirements of Section 10(a) of the
Securities Act.
</DIV>

 </TD>
</TR>

</TABLE>

<!-- link1 "PART II" -->
<DIV align="left"><A NAME="003"></A></DIV>

<DIV align="center" style="font-size: 10pt; margin-top: 18pt"><B>PART II</B>
</DIV>


<DIV align="center" style="font-size: 10pt; margin-top: 6pt"><B>INFORMATION REQUIRED IN THE REGISTRATION STATEMENT</B>
</DIV>

<!-- link2 "Item&nbsp;3. Incorporation of Documents by Reference" -->
<DIV align="left"><A NAME="004"></A></DIV>

<DIV align="left" style="font-size: 10pt; margin-top: 12pt"><B>Item&nbsp;3. Incorporation of Documents by Reference.</B>
</DIV>


<DIV align="left" style="font-size: 10pt; margin-top: 6pt">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;The Registrant hereby incorporates the following documents in this Registration Statement by
reference:
</DIV>

<DIV style="margin-top: 6pt">
<TABLE width="100%" border="0" cellpadding="0" cellspacing="0" style="font-size: 10pt">

<TR valign="top" style="font-size: 10pt; color: #000000; background: transparent">
    <TD width="3%" style="background: transparent">&nbsp;</TD>
    <TD width="2%" nowrap align="left">(1)</TD>
    <TD width="1%">&nbsp;</TD>
    <TD>The Prospectus filed by the Registrant on September&nbsp;23, 2010 pursuant to Rule
424(b) under the Securities Act, relating to its Registration Statement on Form S-11,
as amended (File No.&nbsp;333- 166810); and</TD>
</TR>

<TR>
    <TD style="font-size: 6pt">&nbsp;</TD>
</TR><TR valign="top" style="font-size: 10pt; color: #000000; background: transparent">
    <TD width="3%" style="background: transparent">&nbsp;</TD>
    <TD width="2%" nowrap align="left">(2)</TD>
    <TD width="1%">&nbsp;</TD>
    <TD>The description of the Registrant&#146;s common stock contained in its Registration
Statement on Form 8-A filed on September&nbsp;21, 2010 under Section 12(b) of the Securities
Exchange Act of 1934, as amended (the &#147;Exchange Act&#148;), including any amendment or
report filed for the purpose of updating such description.</TD>
</TR>

</TABLE>
</DIV>

<DIV align="left" style="font-size: 10pt; margin-top: 6pt">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;All documents filed by the Registrant pursuant to Sections&nbsp;13(a), 13(c), 14 or 15(d) of the
Exchange Act prior to the filing of a post-effective amendment that indicates that all securities
offered hereby have been sold or that deregisters all securities covered hereby then remaining
unsold are incorporated by reference in this Registration Statement and are a part hereof from the
date of filing of such documents. Any statement contained in a document incorporated or deemed to
be incorporated by reference herein shall be deemed to be modified or superseded for purposes of
this Registration Statement to the extent that a statement contained herein, or in any subsequently
filed document that also is or is deemed to be incorporated by reference herein, modifies or
supersedes such statement. Any such statement so modified or superseded shall not be deemed,
except as so modified or superseded, to constitute part of this Registration Statement.
</DIV>
<!-- link2 "Item&nbsp;4. Description of Securities" -->
<DIV align="left"><A NAME="005"></A></DIV>

<DIV align="left" style="font-size: 10pt; margin-top: 12pt"><B>Item&nbsp;4. Description of Securities.</B>
</DIV>


<DIV align="left" style="font-size: 10pt; margin-top: 6pt">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Not applicable.
</DIV>
<!-- link2 "Item&nbsp;5. Interests of Named Experts and Counsel" -->
<DIV align="left"><A NAME="006"></A></DIV>

<DIV align="left" style="font-size: 10pt; margin-top: 12pt"><B>Item&nbsp;5. Interests of Named Experts and Counsel.</B>
</DIV>


<DIV align="left" style="font-size: 10pt; margin-top: 6pt">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Not applicable.
</DIV>

<P align="center" style="font-size: 10pt"><!-- Folio -->&nbsp;<!-- /Folio -->
</DIV>

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<P><HR noshade><P>
<H5 align="left" style="page-break-before:always"><A HREF="#toc">Table of Contents</A></H5><P>

<DIV style="font-family: 'Times New Roman',Times,serif">
<!-- link2 "Item&nbsp;6. Indemnification of Directors and Officers" -->
<DIV align="left"><A NAME="007"></A></DIV>

<DIV align="left" style="font-size: 10pt; margin-top: 12pt"><B>Item&nbsp;6. Indemnification of Directors and Officers.</B>
</DIV>


<DIV align="left" style="font-size: 10pt; margin-top: 6pt">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Maryland law permits a Maryland corporation to include in its charter a provision eliminating
the liability of its directors and officers to the corporation and its stockholders for money
damages, except for liability resulting from (a)&nbsp;actual receipt of an improper benefit or profit in
money, property or services or (b)&nbsp;active and deliberate dishonesty that is established by a final
judgment and is material to the cause of action. Our charter contains a provision that eliminates
our directors&#146; and officers&#146; liability to the maximum extent permitted by Maryland law.
</DIV>

<DIV align="left" style="font-size: 10pt; margin-top: 6pt">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Maryland law requires a Maryland corporation (unless its charter provides otherwise, which our
charter does not) to indemnify a director or officer who has been successful, on the merits or
otherwise, in the defense of any proceeding to which he or she is made or threatened to be made a
party by reason of his or her service in that capacity. Maryland law permits a Maryland corporation
to indemnify its present and former directors and officers, among others, against judgments,
penalties, fines, settlements and reasonable expenses actually incurred by them in connection with
any proceeding to which they may be made or threatened to be made a party by reason of their
service in those or other capacities unless it is established that:
</DIV>

<DIV style="margin-top: 6pt">
<TABLE width="100%" border="0" cellpadding="0" cellspacing="0" style="font-size: 10pt">

<TR valign="top" style="font-size: 10pt; color: #000000; background: transparent">
    <TD width="3%" style="background: transparent">&nbsp;</TD>
    <TD width="2%" nowrap align="left"><B>&#149;</B></TD>
    <TD width="1%">&nbsp;</TD>
    <TD>the act or omission of the director or officer was material to the matter giving rise to
the proceeding and (i)&nbsp;was committed in bad faith or (ii)&nbsp;was the result of active and
deliberate dishonesty;</TD>
</TR>

<TR>
    <TD style="font-size: 6pt">&nbsp;</TD>
</TR><TR valign="top" style="font-size: 10pt; color: #000000; background: transparent">
    <TD width="3%" style="background: transparent">&nbsp;</TD>
    <TD width="2%" nowrap align="left"><B>&#149;</B></TD>
    <TD width="1%">&nbsp;</TD>
    <TD>the director or officer actually received an improper personal benefit in money,
property or services; or</TD>
</TR>

<TR>
    <TD style="font-size: 6pt">&nbsp;</TD>
</TR><TR valign="top" style="font-size: 10pt; color: #000000; background: transparent">
    <TD width="3%" style="background: transparent">&nbsp;</TD>
    <TD width="2%" nowrap align="left"><B>&#149;</B></TD>
    <TD width="1%">&nbsp;</TD>
    <TD>in the case of any criminal proceeding, the director or officer had reasonable cause to
believe that the act or omission was unlawful.</TD>
</TR>

</TABLE>
</DIV>

<DIV align="left" style="font-size: 10pt; margin-top: 6pt">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Under Maryland law, a Maryland corporation also may not indemnify a director or officer in a
suit by or in the right of the corporation in which the director or officer was adjudged liable to
the corporation or for a judgment of liability on the basis that a personal benefit was improperly
received. A court may order indemnification if it determines that the director or officer is fairly
and reasonably entitled to indemnification in view of all the relevant circumstances, whether or
not the director or officer met the prescribed standard of conduct; however, indemnification for an
adverse judgment in a suit by us or in our right, or for a judgment of liability on the basis that
personal benefit was improperly received, is limited to expenses.
</DIV>

<DIV align="left" style="font-size: 10pt; margin-top: 6pt">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;In addition, Maryland law permits a Maryland corporation to advance reasonable expenses to a
director or officer upon receipt of (a)&nbsp;a written affirmation by the director or officer of his or
her good-faith belief that he or she has met the standard of conduct necessary for indemnification
and (b)&nbsp;a written undertaking by him or her or on his or her behalf to repay the amount paid or
reimbursed if it is ultimately determined that the standard of conduct was not met.
</DIV>

<DIV align="left" style="font-size: 10pt; margin-top: 6pt">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Our charter authorizes us to obligate our company, and our bylaws obligate us, to the maximum
extent permitted by Maryland law, to indemnify
</DIV>

<DIV style="margin-top: 6pt">
<TABLE width="100%" border="0" cellpadding="0" cellspacing="0" style="font-size: 10pt">

<TR valign="top" style="font-size: 10pt; color: #000000; background: transparent">
    <TD width="3%" style="background: transparent">&nbsp;</TD>
    <TD width="2%" nowrap align="left"><B>&#149;</B></TD>
    <TD width="1%">&nbsp;</TD>
    <TD>any present or former director or officer who is made or threatened to be made a party
to a proceeding by reason of his or her service in such capacity, and</TD>
</TR>

<TR>
    <TD style="font-size: 6pt">&nbsp;</TD>
</TR><TR valign="top" style="font-size: 10pt; color: #000000; background: transparent">
    <TD width="3%" style="background: transparent">&nbsp;</TD>
    <TD width="2%" nowrap align="left"><B>&#149;</B></TD>
    <TD width="1%">&nbsp;</TD>
    <TD>any individual who, while a director or officer and, at our request, serves or has
served as a director, officer, trustee, partner, member or manager of another corporation,
real estate investment trust, partnership, limited liability company, joint venture, trust,
employee benefit plan or other enterprise who is made or threatened to be made a party to a
proceeding by reason of his or her service in such capacity,</TD>
</TR>

</TABLE>
</DIV>
<DIV align="left" style="font-size: 10pt; margin-top: 6pt">against any claim or liability by reason of that status and to pay or reimburse his or her
reasonable expenses in advance of final disposition of a proceeding without requiring a preliminary
determination of his or her ultimate entitlement to indemnification. The rights to indemnification
and advance of expenses provided by our charter and bylaws vest immediately upon election of a
director or officer. Our charter and bylaws also permit us to indemnify and advance expenses to any
individual who served a predecessor of our company or any entity acquired by our company, or its
predecessors, if any, or any partnership controlled by our company, or its predecessors, if any, in
any of the capacities described above and any employee or agent of us or a predecessor of our
company or acquired entity. We have entered into indemnification agreements with each of our
executive officers and directors that obligate us to indemnify them to the maximum extent permitted
by Maryland law.
</DIV>




<P align="center" style="font-size: 10pt"><!-- Folio -->&nbsp;<!-- /Folio -->
</DIV>

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<DIV style="font-family: 'Times New Roman',Times,serif">




<DIV align="left" style="font-size: 10pt; margin-top: 6pt">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;In addition, our directors and officers are also indemnified by our operating partnership for
the same or similar liabilities and expenses pursuant to the partnership agreement of CoreSite,
L.P.
</DIV>
<!-- link2 "Item&nbsp;7. Exemption From Registration Claimed" -->
<DIV align="left"><A NAME="008"></A></DIV>

<DIV align="left" style="font-size: 10pt; margin-top: 12pt"><B>Item&nbsp;7. Exemption From Registration Claimed.</B>
</DIV>


<DIV align="left" style="font-size: 10pt; margin-top: 6pt">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Not applicable.
</DIV>
<!-- link2 "Item&nbsp;8. Exhibits" -->
<DIV align="left"><A NAME="009"></A></DIV>

<DIV align="left" style="font-size: 10pt; margin-top: 12pt"><B>Item&nbsp;8. Exhibits.</B>
</DIV>

<DIV align="center">
<TABLE style="font-size: 10pt" cellspacing="0" border="0" cellpadding="0" width="100%">
<!-- Begin Table Head -->
<TR valign="bottom">
    <TD width="8%">&nbsp;</TD>
    <TD width="2%">&nbsp;</TD>
    <TD width="90%">&nbsp;</TD>
</TR>
<TR style="font-size: 8pt" valign="bottom">
    <TD nowrap align="left" style="border-bottom: 1px solid #000000"><B>Exhibit</B></TD>
    <TD>&nbsp;</TD>
    <TD nowrap align="center" style="border-bottom: 1px solid #000000"><B>Description</B></TD>
</TR>

<!-- End Table Head -->
<!-- Begin Table Body -->
<TR valign="bottom">
    <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px">4.1
</DIV></TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">Articles of Amendment and Restatement of CoreSite Realty
Corporation (Incorporated by reference to Exhibit&nbsp;3.1 to the
Registrant&#146;s Registration Statement on Form&nbsp;S-11/A dated September
22, 2010 (Registration No.&nbsp;333-166810)).</TD>
</TR>
<TR valign="bottom"><!-- Blank Space -->
    <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px">&nbsp;</DIV></TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">&nbsp;</TD>
</TR>
<TR valign="bottom">
    <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px">4.2
</DIV></TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">Amended and Restated Bylaws of CoreSite Realty Corporation
(Incorporated by reference to Exhibit&nbsp;3.2 to the Registrant&#146;s
Registration Statement on Form&nbsp;S-11/A dated September&nbsp;22, 2010
(Registration No.&nbsp;333-166810)).</TD>
</TR>
<TR valign="bottom"><!-- Blank Space -->
    <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px">&nbsp;</DIV></TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">&nbsp;</TD>
</TR>
<TR valign="bottom">
    <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px">5.1
</DIV></TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">Opinion of Venable LLP, with respect to the legality of the shares
being registered (filed herewith).</TD>
</TR>
<TR valign="bottom"><!-- Blank Space -->
    <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px">&nbsp;</DIV></TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">&nbsp;</TD>
</TR>
<TR valign="bottom">
    <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px">10.1
</DIV></TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">2010 Equity Incentive Award Plan (Incorporated by reference to
Exhibit&nbsp;10.2 to the Registrant&#146;s Registration Statement on Form
S-11/A dated September&nbsp;22, 2010 (Registration No.&nbsp;333-166810)).</TD>
</TR>
<TR valign="bottom"><!-- Blank Space -->
    <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px">&nbsp;</DIV></TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">&nbsp;</TD>
</TR>
<TR valign="bottom">
    <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px">23.1
</DIV></TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">Consent of KPMG LLP (filed herewith).</TD>
</TR>
<TR valign="bottom"><!-- Blank Space -->
    <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px">&nbsp;</DIV></TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">&nbsp;</TD>
</TR>
<TR valign="bottom">
    <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px">23.2
</DIV></TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">Consent of Venable LLP (included in Exhibit&nbsp;5.1).</TD>
</TR>
<!-- End Table Body -->
</TABLE>
</DIV>

<!-- link2 "Item&nbsp;9. Undertakings" -->
<DIV align="left"><A NAME="010"></A></DIV>

<DIV align="left" style="font-size: 10pt; margin-top: 12pt"><B>Item&nbsp;9. Undertakings.</B>
</DIV>


<DIV style="margin-top: 6pt">
<TABLE width="100%" border="0" cellpadding="0" cellspacing="0" style="font-size: 10pt">

<TR valign="top" style="font-size: 10pt; color: #000000; background: transparent">
    <TD width="1%" nowrap align="left">(a)</TD>
    <TD width="1%">&nbsp;</TD>
    <TD>The undersigned Registrant hereby undertakes:</TD>
</TR>

</TABLE>
</DIV>

<DIV align="left" style="font-size: 10pt; margin-top: 6pt">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(1)&nbsp;To file, during any period in which offers or sales are being made, a post-effective
amendment to this Registration Statement,
</DIV>


<DIV align="left" style="font-size: 10pt; margin-top: 6pt; margin-left: 6%">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(i) to include any prospectus required by Section&nbsp;10(a)(3) of the Securities Act;
</DIV>


<DIV align="left" style="font-size: 10pt; margin-top: 6pt; margin-left: 6%">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(ii) to reflect in the prospectus any facts or events arising after the effective
date of this Registration Statement (or the most recent post-effective amendment
thereof) which, individually or in the aggregate, represent a fundamental change in the
information set forth in this Registration Statement. Notwithstanding the foregoing,
any increase or decrease in volume of securities offered (if the total dollar value of
securities offered would not exceed that which was registered) and any deviation from
the low or high end of the estimated maximum offering range may be reflected in the
form of prospectus filed with the Commission pursuant to Rule 424(b) if, in the
aggregate, the changes in volume and price represent no more than 20% change in the
maximum aggregate offering price set forth in the &#147;Calculation of Registration Fee&#148;
table in the effective registration statement; and
</DIV>


<DIV align="left" style="font-size: 10pt; margin-top: 6pt; margin-left: 6%">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(iii) to include any material information with respect to the plan of distribution
not previously disclosed in this Registration Statement or any material change to such
information in this Registration Statement;
</DIV>
<DIV align="left" style="font-size: 10pt; margin-top: 6pt"><I>provided, however</I>, that paragraphs (a)(1)(i) and (a)(1)(ii) do not apply if this Registration
Statement is on Form S-8 and the information required to be included in a post-effective amendment
by those paragraphs is contained in reports filed with or furnished to the Commission by the
Registrant pursuant to Section&nbsp;13 or Section 15(d) of the Exchange Act that are incorporated by
reference in this Registration Statement.
</DIV>





<P align="center" style="font-size: 10pt"><!-- Folio -->&nbsp;<!-- /Folio -->
</DIV>

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<DIV style="font-family: 'Times New Roman',Times,serif">




<DIV align="left" style="font-size: 10pt; margin-top: 6pt">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(2)&nbsp;That, for the purpose of determining any liability under the Securities Act, each such
post-effective amendment shall be deemed to be a new registration statement relating to the
securities offered therein, and the offering of such securities at that time shall be deemed to be
the initial bona fide offering thereof.
</DIV>

<DIV align="left" style="font-size: 10pt; margin-top: 6pt">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(3)&nbsp;To remove from registration by means of a post-effective amendment any of the securities
being registered which remain unsold at the termination of the offering.
</DIV>
<DIV align="left" style="font-size: 10pt; margin-top: 6pt">(b)&nbsp;The undersigned Registrant hereby undertakes that, for purposes of determining any liability
under the Securities Act, each filing of the Registrant&#146;s annual report pursuant to Section 13(a)
or Section 15(d) of the Exchange Act (and, where applicable, each filing of an employee benefit
plan&#146;s annual report pursuant to Section 15(d) of the Exchange Act) that is incorporated by
reference in this Registration Statement shall be deemed to be a new registration statement,
relating to the securities offered therein, and the offering of such securities at that time shall
be deemed to be the initial bona fide offering thereof.
</DIV>

<DIV align="left" style="font-size: 10pt; margin-top: 6pt">(c)&nbsp;Insofar as indemnification for liabilities arising under the Securities Act may be permitted to
directors, officers and controlling persons of the Registrant pursuant to the foregoing provisions,
or otherwise, the Registrant has been advised that in the opinion of the Securities and Exchange
Commission such indemnification is against public policy as expressed in the Securities Act and is,
therefore, unenforceable. In the event that a claim for indemnification against such liabilities
(other than the payment by the Registrant of expenses incurred or paid by a director, officer or
controlling person of the Registrant in the successful defense of any action, suit or proceeding)
is asserted by such director, officer or controlling person in connection with the securities being
registered, the Registrant will, unless in the opinion of its counsel the matter has been settled
by controlling precedent, submit to a court of appropriate jurisdiction the question whether such
indemnification by it is against public policy as expressed in the Securities Act and will be
governed by the final adjudication of such issue.
</DIV>



<P align="center" style="font-size: 10pt"><!-- Folio -->&nbsp;<!-- /Folio -->
</DIV>




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<P><HR noshade><P>
<H5 align="left" style="page-break-before:always"><A HREF="#toc">Table of Contents</A></H5><P>
<DIV style="font-family: 'Times New Roman',Times,serif">

<!-- link1 " SIGNATURES" -->
<DIV align="left"><A NAME="011"></A></DIV>

<DIV align="center" style="font-size: 10pt; margin-top: 18pt"><B>SIGNATURES</B>
</DIV>


<DIV align="left" style="font-size: 10pt; margin-top: 6pt">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Pursuant to the requirements of the Securities Act of 1933, as amended (the &#147;Securities Act&#148;),
the registrant certifies that it has reasonable grounds to believe that it meets all of the
requirements for filing on Form S-8 and has duly caused this Registration Statement to be signed on
its behalf by the undersigned, thereunto duly authorized, in the City of Denver, State of Colorado,
on this 28<SUP style="FONT-size: 85%; vertical-align: text-top">th</SUP> day of September, 2010.
</DIV>

<TABLE width="100%" border="0" cellspacing="0" cellpadding="0" style="font-size: 10pt">
<TR>
    <TD width="48%">&nbsp;</TD>
    <TD width="1%">&nbsp;</TD>
    <TD width="1%">&nbsp;</TD>
    <TD width="35%">&nbsp;</TD>
    <TD width="15%">&nbsp;</TD>
</TR>
<TR>
    <TD valign="top" align="left">&nbsp;</TD>
    <TD colspan="3" align="left">CORESITE REALTY CORPORATION<BR>
&nbsp;</TD>
    <TD>&nbsp;</TD>
</TR><TR>
    <TD align="left">&nbsp;</TD>
    <TD valign="top">By:&nbsp;&nbsp;</TD>
    <TD colspan="2" style="border-bottom: 1px solid #000000" align="left">/s/ Thomas M. Ray
&nbsp;</TD>
    <TD>&nbsp;</TD>
</TR><TR>
    <TD align="left">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD valign="top">Name:&nbsp;&nbsp;</TD>
    <TD align="left">Thomas M. Ray&nbsp;</TD>
    <TD>&nbsp;</TD>
</TR><TR>
    <TD align="left">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD valign="top">Title:&nbsp;&nbsp;</TD>
    <TD align="left">President&nbsp;</TD>
    <TD>&nbsp;</TD>
</TR>
<TR>
    <TD colspan="5">&nbsp;</TD>
</TR>
</TABLE>


<DIV align="left" style="font-size: 10pt; margin-top: 6pt">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Pursuant to the requirements of the Securities Act, this Registration Statement has been
signed by the following persons in the capacities and on the dates indicated.
</DIV>
<DIV align="center">
<TABLE style="font-size: 10pt" cellspacing="0" border="0" cellpadding="0" width="100%">
<!-- Begin Table Head -->
<TR valign="bottom">
    <TD width="35%">&nbsp;</TD>
    <TD width="1%">&nbsp;</TD>
    <TD width="32%">&nbsp;</TD>
    <TD width="1%">&nbsp;</TD>
    <TD width="31%">&nbsp;</TD>
</TR>
<TR style="font-size: 8pt" valign="bottom">
    <TD nowrap align="center" style="border-bottom: 1px solid #000000">Signature</TD>
    <TD>&nbsp;</TD>
    <TD nowrap align="center" style="border-bottom: 1px solid #000000">Title</TD>
    <TD>&nbsp;</TD>
    <TD nowrap align="center" style="border-bottom: 1px solid #000000">Date</TD>
</TR>

<!-- End Table Head -->
<!-- Begin Table Body -->
<TR valign="bottom"><!-- Blank Space -->
    <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px">&nbsp;</DIV></TD>
    <TD>&nbsp;</TD>
    <TD align="center" valign="bottom">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="center" valign="bottom">&nbsp;</TD>
</TR>
<TR valign="bottom">
    <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px">/s/ Thomas M. Ray
<DIV style="font-size: 1pt; border-top: 1px solid #000000">&nbsp;</DIV>
</DIV></TD>
    <TD>&nbsp;</TD>
    <TD align="center" valign="bottom">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="center" valign="bottom">&nbsp;</TD>
</TR>
<TR valign="bottom">
    <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px">Thomas M. Ray
</DIV></TD>
    <TD>&nbsp;</TD>
    <TD align="center" valign="bottom">President and Director
</TD>
    <TD>&nbsp;</TD>
    <TD align="center" valign="bottom">September&nbsp;28 2010</TD>
</TR>
<TR valign="bottom">
    <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px">&nbsp;
</DIV></TD>
    <TD>&nbsp;</TD>
    <TD align="center" valign="bottom">(Principal Executive Officer)</TD>
    <TD>&nbsp;</TD>
    <TD align="center" valign="bottom">&nbsp;</TD>
</TR>
<TR valign="bottom"><!-- Blank Space -->
    <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px">&nbsp;</DIV></TD>
    <TD>&nbsp;</TD>
    <TD align="center" valign="bottom">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="center" valign="bottom">&nbsp;</TD>
</TR>
<TR valign="bottom">
    <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px">/s/ Deedee M. Beckman
<DIV style="font-size: 1pt; border-top: 1px solid #000000">&nbsp;</DIV>
</DIV></TD>
    <TD>&nbsp;</TD>
    <TD align="center" valign="bottom">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="center" valign="bottom">&nbsp;</TD>
</TR>
<TR valign="bottom">
    <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px">Deedee M. Beckman
</DIV></TD>
    <TD>&nbsp;</TD>
    <TD align="center" valign="bottom">Treasurer and Chief Financial Officer
</TD>
    <TD>&nbsp;</TD>
    <TD align="center" valign="bottom">September&nbsp;28, 2010</TD>
</TR>
<TR valign="bottom">
    <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px">&nbsp;
</DIV></TD>
    <TD>&nbsp;</TD>
    <TD align="center" valign="bottom">(Principal Financial Officer and</TD>
    <TD>&nbsp;</TD>
    <TD align="center" valign="bottom">&nbsp;</TD>
</TR>
<TR valign="bottom">
    <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px">&nbsp;
</DIV></TD>
    <TD>&nbsp;</TD>
    <TD align="center" valign="bottom">Principal Accounting Officer)</TD>
    <TD>&nbsp;</TD>
    <TD align="center" valign="bottom">&nbsp;</TD>
</TR>
<TR valign="bottom"><!-- Blank Space -->
    <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px">&nbsp;</DIV></TD>
    <TD>&nbsp;</TD>
    <TD align="center" valign="bottom">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="center" valign="bottom">&nbsp;</TD>
</TR>
<TR valign="bottom">
    <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px">/s/ James A. Attwood, Jr.
<DIV style="font-size: 1pt; border-top: 1px solid #000000">&nbsp;</DIV>
</DIV></TD>
    <TD>&nbsp;</TD>
    <TD align="center" valign="bottom">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="center" valign="bottom">&nbsp;</TD>
</TR>
<TR valign="bottom">
    <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px">James A. Attwood, Jr.
</DIV></TD>
    <TD>&nbsp;</TD>
    <TD align="center" valign="bottom">Director
</TD>
    <TD>&nbsp;</TD>
    <TD align="center" valign="bottom">September&nbsp;28, 2010</TD>
</TR>
<TR valign="bottom"><!-- Blank Space -->
    <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px">&nbsp;</DIV></TD>
    <TD>&nbsp;</TD>
    <TD align="center" valign="bottom">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="center" valign="bottom">&nbsp;</TD>
</TR>
<TR valign="bottom">
    <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px">/s/ Michael R. Koehler
<DIV style="font-size: 1pt; border-top: 1px solid #000000">&nbsp;</DIV>
</DIV></TD>
    <TD>&nbsp;</TD>
    <TD align="center" valign="bottom">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="center" valign="bottom">&nbsp;</TD>
</TR>
<TR valign="bottom">
    <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px">Michael R. Koehler
</DIV></TD>
    <TD>&nbsp;</TD>
    <TD align="center" valign="bottom">Director
</TD>
    <TD>&nbsp;</TD>
    <TD align="center" valign="bottom">September&nbsp;28, 2010</TD>
</TR>
<TR valign="bottom"><!-- Blank Space -->
    <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px">&nbsp;</DIV></TD>
    <TD>&nbsp;</TD>
    <TD align="center" valign="bottom">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="center" valign="bottom">&nbsp;</TD>
</TR>
<TR valign="bottom">
    <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px">/s/ Robert G. Stuckey
<DIV style="font-size: 1pt; border-top: 1px solid #000000">&nbsp;</DIV>
</DIV></TD>
    <TD>&nbsp;</TD>
    <TD align="center" valign="bottom">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="center" valign="bottom">&nbsp;</TD>
</TR>
<TR valign="bottom">
    <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px">Robert G. Stuckey
</DIV></TD>
    <TD>&nbsp;</TD>
    <TD align="center" valign="bottom">Director
</TD>
    <TD>&nbsp;</TD>
    <TD align="center" valign="bottom">September&nbsp;28, 2010</TD>
</TR>
<TR valign="bottom"><!-- Blank Space -->
    <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px">&nbsp;</DIV></TD>
    <TD>&nbsp;</TD>
    <TD align="center" valign="bottom">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="center" valign="bottom">&nbsp;</TD>
</TR>
<TR valign="bottom">
    <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px">/s/ Paul E. Szurek
<DIV style="font-size: 1pt; border-top: 1px solid #000000">&nbsp;</DIV>
</DIV></TD>
    <TD>&nbsp;</TD>
    <TD align="center" valign="bottom">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="center" valign="bottom">&nbsp;</TD>
</TR>
<TR valign="bottom">
    <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px">Paul E. Szurek
</DIV></TD>
    <TD>&nbsp;</TD>
    <TD align="center" valign="bottom">Director
</TD>
    <TD>&nbsp;</TD>
    <TD align="center" valign="bottom">September&nbsp;28, 2010</TD>
</TR>
<TR valign="bottom"><!-- Blank Space -->
    <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px">&nbsp;</DIV></TD>
    <TD>&nbsp;</TD>
    <TD align="center" valign="bottom">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="center" valign="bottom">&nbsp;</TD>
</TR>
<TR valign="bottom">
    <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px">/s/ J. David Thompson
<DIV style="font-size: 1pt; border-top: 1px solid #000000">&nbsp;</DIV>
</DIV></TD>
    <TD>&nbsp;</TD>
    <TD align="center" valign="bottom">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="center" valign="bottom">&nbsp;</TD>
</TR>
<TR valign="bottom">
    <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px">J. David Thompson
</DIV></TD>
    <TD>&nbsp;</TD>
    <TD align="center" valign="bottom">Director
</TD>
    <TD>&nbsp;</TD>
    <TD align="center" valign="bottom">September&nbsp;28, 2010</TD>
</TR>
<TR valign="bottom"><!-- Blank Space -->
    <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px">&nbsp;</DIV></TD>
    <TD>&nbsp;</TD>
    <TD align="center" valign="bottom">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="center" valign="bottom">&nbsp;</TD>
</TR>
<TR valign="bottom">
    <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px">/s/ David A. Wilson
<DIV style="font-size: 1pt; border-top: 1px solid #000000">&nbsp;</DIV>
David A. Wilson
</DIV></TD>
    <TD>&nbsp;</TD>
    <TD align="center" valign="bottom">&nbsp;Director
</TD>
    <TD>&nbsp;</TD>
    <TD align="center" valign="bottom">September&nbsp;28, 2010</TD>
</TR>
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<H5 align="left" style="page-break-before:always"><A HREF="#toc">Table of Contents</A></H5><P>

<DIV style="font-family: 'Times New Roman',Times,serif">

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<DIV align="center" style="font-size: 10pt; margin-top: 18pt"><B>EXHIBIT INDEX</B>
</DIV>

<DIV align="center">
<TABLE style="font-size: 10pt" cellspacing="0" border="0" cellpadding="0" width="100%">
<!-- Begin Table Head -->
<TR valign="bottom">
    <TD width="5%">&nbsp;</TD>
    <TD width="3%">&nbsp;</TD>
    <TD width="92%">&nbsp;</TD>
</TR>
<TR style="font-size: 8pt" valign="bottom">
    <TD nowrap align="center" style="border-bottom: 1px solid #000000"><B>Exhibit</B></TD>
    <TD>&nbsp;</TD>
    <TD nowrap align="center" style="border-bottom: 1px solid #000000"><B>Description</B></TD>
</TR>

<!-- End Table Head -->
<!-- Begin Table Body -->
<TR valign="bottom">
    <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px">4.1
</DIV></TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">Articles of Amendment and Restatement of CoreSite Realty
Corporation (Incorporated by reference to Exhibit&nbsp;3.1 to the
Registrant&#146;s Registration Statement on Form&nbsp;S-11/A dated September
22, 2010 (Registration No.&nbsp;333-166810)).</TD>
</TR>
<TR valign="bottom"><!-- Blank Space -->
    <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px">&nbsp;</DIV></TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">&nbsp;</TD>
</TR>
<TR valign="bottom">
    <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px">4.2
</DIV></TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">Amended and Restated Bylaws of CoreSite Realty Corporation
(Incorporated by reference to Exhibit&nbsp;3.2 to the Registrant&#146;s
Registration Statement on Form&nbsp;S-11/A dated September&nbsp;22, 2010
(Registration No.&nbsp;333-166810)).</TD>
</TR>
<TR valign="bottom"><!-- Blank Space -->
    <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px">&nbsp;</DIV></TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">&nbsp;</TD>
</TR>
<TR valign="bottom">
    <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px">5.1
</DIV></TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">Opinion of Venable LLP, with respect to the legality of the shares
being registered (filed herewith).</TD>
</TR>
<TR valign="bottom"><!-- Blank Space -->
    <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px">&nbsp;</DIV></TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">&nbsp;</TD>
</TR>
<TR valign="bottom">
    <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px">10.1
</DIV></TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">2010 Equity Incentive Award Plan (Incorporated by reference to
Exhibit&nbsp;10.2 to the Registrant&#146;s Registration Statement on Form
S-11/A dated September&nbsp;22, 2010 (Registration No.&nbsp;333-166810)).</TD>
</TR>
<TR valign="bottom"><!-- Blank Space -->
    <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px">&nbsp;</DIV></TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">&nbsp;</TD>
</TR>
<TR valign="bottom">
    <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px">23.1
</DIV></TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">Consent of KPMG LLP (filed herewith).</TD>
</TR>
<TR valign="bottom"><!-- Blank Space -->
    <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px">&nbsp;</DIV></TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">&nbsp;</TD>
</TR>
<TR valign="bottom">
    <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px">23.2
</DIV></TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">Consent of Venable LLP (included in Exhibit&nbsp;5.1).</TD>
</TR>
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sv8
Table of Contents
UNITED STATES
SECURITIES AND EXCHANGE COMMISSION
WASHINGTON, D.C. 20549
FORM S-8
REGISTRATION STATEMENT
UNDER
THE SECURITIES ACT OF 1933
CoreSite Realty Corporation
(Exact name of registrant as specified in its charter)
Maryland
(State or other jurisdiction of
incorporation or organization)
27-1925611
(I.R.S. Employer
Identification No.)
1050 17
th
Street, Suite 800
Denver, CO 80265
(Address of Principal Executive Offices)
CORESITE REALTY CORPORATION AND CORESITE, L.P.
2010 EQUITY INCENTIVE AWARD PLAN
(Full title of the plan)
Thomas M. Ray
President & Chief Executive Officer
CoreSite Realty Corporation
1050 17
th
Street, Suite 800
Denver, CO 80265
(Name and address of agent for service)
(866) 777-2673
(Telephone number, including area code, of agent for service)
Copies to:
Raymond Y. Lin
Patrick H. Shannon
Latham & Watkins LLP
885 Third Avenue
New York, New York 10022
(212) 906-1200
Indicate by check mark whether the registrant is a large accelerated filer, an accelerated
filer, a non-accelerated filer, or a smaller reporting company. See the definitions of "large
accelerated filer," "accelerated filer" and "smaller reporting company" in Rule 12b-2 of the
Exchange Act.
Large accelerated filer
o
Accelerated filer
o
Non-accelerated filer
þ
Smaller reporting company
o
(do not check if a smaller reporting company)
CALCULATION OF REGISTRATION FEE
Proposed maximum
Amount
Proposed maximum
aggregate
Amount of
to be
offering price
offering
registration
Title of securities to be registered
registered (1)
per share (2)
price (2)
fee
Common Stock, par value $0.01 per share
3,000,000 Shares
$16.01
$48,030,000.00
$3,424.54
(1)
Pursuant to Rule 416 under the Securities Act of 1933, as amended, this Registration
Statement shall also cover any additional shares of common stock that become issuable under
the above-named plan by reason of any stock dividend, stock split, recapitalization or any
other similar transaction effected without the receipt of consideration that results in an
increase in the number of the Registrant's outstanding shares of common stock.
(2)
Estimated solely for purposes of calculating the registration fee pursuant to Rules
457(c) and (h) of the Securities Act of 1933. The proposed maximum offering price per share,
proposed maximum aggregate offering price and the amount of the registration fee are based on
the average of the high and low prices for the common stock as reported on the New York Stock
Exchange on September 23, 2010.
Proposed sales to take place as soon after the effective date of this Registration Statement as awards granted
under the above-named plan are granted, exercised and/or distributed.
TABLE OF CONTENTS
PART I
Item 1. Plan Information
Item 2. Registrant Information and Employee Plan Annual Information
PART II
Item 3. Incorporation of Documents by Reference
Item 4. Description of Securities
Item 5. Interests of Named Experts and Counsel
Item 6. Indemnification of Directors and Officers
Item 7. Exemption From Registration Claimed
Item 8. Exhibits
Item 9. Undertakings
SIGNATURES
EXHIBIT INDEX
EX-5.1
EX-23.1
Table of Contents
PART I
INFORMATION REQUIRED IN THE SECTION 10(a) PROSPECTUS
Item 1. Plan Information.
Not required to be filed with this Registration Statement.*
Item 2. Registrant Information and Employee Plan Annual Information.
Not required to be filed with this Registration Statement.*
*
The documents containing the information specified in this Part I will be sent or given to
participants in the CoreSite Realty Corporation's (the "Registrant") 2010 Equity Incentive Award
Plan, as specified by Rule 428(b)(1) under the Securities Act of 1933, as amended (the "Securities
Act"). In accordance with Rule 428 of the Securities Act and the requirements of Part I of Form
S-8, such documents need not be filed with the Securities and Exchange Commission (the
"Commission") either as part of this Registration Statement or as prospectuses or prospectus
supplements pursuant to Rule 424 promulgated under the Securities Act. These documents and the
documents incorporated by reference in this Registration Statement pursuant to Item 3 of Part II
hereof, taken together, constitute a prospectus that meets the requirements of Section 10(a) of the
Securities Act.
PART II
INFORMATION REQUIRED IN THE REGISTRATION STATEMENT
Item 3. Incorporation of Documents by Reference.
The Registrant hereby incorporates the following documents in this Registration Statement by
reference:
(1)
The Prospectus filed by the Registrant on September 23, 2010 pursuant to Rule
424(b) under the Securities Act, relating to its Registration Statement on Form S-11,
as amended (File No. 333- 166810); and
(2)
The description of the Registrant's common stock contained in its Registration
Statement on Form 8-A filed on September 21, 2010 under Section 12(b) of the Securities
Exchange Act of 1934, as amended (the "Exchange Act"), including any amendment or
report filed for the purpose of updating such description.
All documents filed by the Registrant pursuant to Sections 13(a), 13(c), 14 or 15(d) of the
Exchange Act prior to the filing of a post-effective amendment that indicates that all securities
offered hereby have been sold or that deregisters all securities covered hereby then remaining
unsold are incorporated by reference in this Registration Statement and are a part hereof from the
date of filing of such documents. Any statement contained in a document incorporated or deemed to
be incorporated by reference herein shall be deemed to be modified or superseded for purposes of
this Registration Statement to the extent that a statement contained herein, or in any subsequently
filed document that also is or is deemed to be incorporated by reference herein, modifies or
supersedes such statement. Any such statement so modified or superseded shall not be deemed,
except as so modified or superseded, to constitute part of this Registration Statement.
Item 4. Description of Securities.
Not applicable.
Item 5. Interests of Named Experts and Counsel.
Not applicable.
Table of Contents
Item 6. Indemnification of Directors and Officers.
Maryland law permits a Maryland corporation to include in its charter a provision eliminating
the liability of its directors and officers to the corporation and its stockholders for money
damages, except for liability resulting from (a) actual receipt of an improper benefit or profit in
money, property or services or (b) active and deliberate dishonesty that is established by a final
judgment and is material to the cause of action. Our charter contains a provision that eliminates
our directors' and officers' liability to the maximum extent permitted by Maryland law.
Maryland law requires a Maryland corporation (unless its charter provides otherwise, which our
charter does not) to indemnify a director or officer who has been successful, on the merits or
otherwise, in the defense of any proceeding to which he or she is made or threatened to be made a
party by reason of his or her service in that capacity. Maryland law permits a Maryland corporation
to indemnify its present and former directors and officers, among others, against judgments,
penalties, fines, settlements and reasonable expenses actually incurred by them in connection with
any proceeding to which they may be made or threatened to be made a party by reason of their
service in those or other capacities unless it is established that:
•
the act or omission of the director or officer was material to the matter giving rise to
the proceeding and (i) was committed in bad faith or (ii) was the result of active and
deliberate dishonesty;
•
the director or officer actually received an improper personal benefit in money,
property or services; or
•
in the case of any criminal proceeding, the director or officer had reasonable cause to
believe that the act or omission was unlawful.
Under Maryland law, a Maryland corporation also may not indemnify a director or officer in a
suit by or in the right of the corporation in which the director or officer was adjudged liable to
the corporation or for a judgment of liability on the basis that a personal benefit was improperly
received. A court may order indemnification if it determines that the director or officer is fairly
and reasonably entitled to indemnification in view of all the relevant circumstances, whether or
not the director or officer met the prescribed standard of conduct; however, indemnification for an
adverse judgment in a suit by us or in our right, or for a judgment of liability on the basis that
personal benefit was improperly received, is limited to expenses.
In addition, Maryland law permits a Maryland corporation to advance reasonable expenses to a
director or officer upon receipt of (a) a written affirmation by the director or officer of his or
her good-faith belief that he or she has met the standard of conduct necessary for indemnification
and (b) a written undertaking by him or her or on his or her behalf to repay the amount paid or
reimbursed if it is ultimately determined that the standard of conduct was not met.
Our charter authorizes us to obligate our company, and our bylaws obligate us, to the maximum
extent permitted by Maryland law, to indemnify
•
any present or former director or officer who is made or threatened to be made a party
to a proceeding by reason of his or her service in such capacity, and
•
any individual who, while a director or officer and, at our request, serves or has
served as a director, officer, trustee, partner, member or manager of another corporation,
real estate investment trust, partnership, limited liability company, joint venture, trust,
employee benefit plan or other enterprise who is made or threatened to be made a party to a
proceeding by reason of his or her service in such capacity,
against any claim or liability by reason of that status and to pay or reimburse his or her
reasonable expenses in advance of final disposition of a proceeding without requiring a preliminary
determination of his or her ultimate entitlement to indemnification. The rights to indemnification
and advance of expenses provided by our charter and bylaws vest immediately upon election of a
director or officer. Our charter and bylaws also permit us to indemnify and advance expenses to any
individual who served a predecessor of our company or any entity acquired by our company, or its
predecessors, if any, or any partnership controlled by our company, or its predecessors, if any, in
any of the capacities described above and any employee or agent of us or a predecessor of our
company or acquired entity. We have entered into indemnification agreements with each of our
executive officers and directors that obligate us to indemnify them to the maximum extent permitted
by Maryland law.
Table of Contents
In addition, our directors and officers are also indemnified by our operating partnership for
the same or similar liabilities and expenses pursuant to the partnership agreement of CoreSite,
L.P.
Item 7. Exemption From Registration Claimed.
Not applicable.
Item 8. Exhibits.
Exhibit
Description
4.1
Articles of Amendment and Restatement of CoreSite Realty
Corporation (Incorporated by reference to Exhibit 3.1 to the
Registrant's Registration Statement on Form S-11/A dated September
22, 2010 (Registration No. 333-166810)).
4.2
Amended and Restated Bylaws of CoreSite Realty Corporation
(Incorporated by reference to Exhibit 3.2 to the Registrant's
Registration Statement on Form S-11/A dated September 22, 2010
(Registration No. 333-166810)).
5.1
Opinion of Venable LLP, with respect to the legality of the shares
being registered (filed herewith).
10.1
2010 Equity Incentive Award Plan (Incorporated by reference to
Exhibit 10.2 to the Registrant's Registration Statement on Form
S-11/A dated September 22, 2010 (Registration No. 333-166810)).
23.1
Consent of KPMG LLP (filed herewith).
23.2
Consent of Venable LLP (included in Exhibit 5.1).
Item 9. Undertakings.
(a)
The undersigned Registrant hereby undertakes:
(1) To file, during any period in which offers or sales are being made, a post-effective
amendment to this Registration Statement,
(i) to include any prospectus required by Section 10(a)(3) of the Securities Act;
(ii) to reflect in the prospectus any facts or events arising after the effective
date of this Registration Statement (or the most recent post-effective amendment
thereof) which, individually or in the aggregate, represent a fundamental change in the
information set forth in this Registration Statement. Notwithstanding the foregoing,
any increase or decrease in volume of securities offered (if the total dollar value of
securities offered would not exceed that which was registered) and any deviation from
the low or high end of the estimated maximum offering range may be reflected in the
form of prospectus filed with the Commission pursuant to Rule 424(b) if, in the
aggregate, the changes in volume and price represent no more than 20% change in the
maximum aggregate offering price set forth in the "Calculation of Registration Fee"
table in the effective registration statement; and
(iii) to include any material information with respect to the plan of distribution
not previously disclosed in this Registration Statement or any material change to such
information in this Registration Statement;
provided, however
, that paragraphs (a)(1)(i) and (a)(1)(ii) do not apply if this Registration
Statement is on Form S-8 and the information required to be included in a post-effective amendment
by those paragraphs is contained in reports filed with or furnished to the Commission by the
Registrant pursuant to Section 13 or Section 15(d) of the Exchange Act that are incorporated by
reference in this Registration Statement.
Table of Contents
(2) That, for the purpose of determining any liability under the Securities Act, each such
post-effective amendment shall be deemed to be a new registration statement relating to the
securities offered therein, and the offering of such securities at that time shall be deemed to be
the initial bona fide offering thereof.
(3) To remove from registration by means of a post-effective amendment any of the securities
being registered which remain unsold at the termination of the offering.
(b) The undersigned Registrant hereby undertakes that, for purposes of determining any liability
under the Securities Act, each filing of the Registrant's annual report pursuant to Section 13(a)
or Section 15(d) of the Exchange Act (and, where applicable, each filing of an employee benefit
plan's annual report pursuant to Section 15(d) of the Exchange Act) that is incorporated by
reference in this Registration Statement shall be deemed to be a new registration statement,
relating to the securities offered therein, and the offering of such securities at that time shall
be deemed to be the initial bona fide offering thereof.
(c) Insofar as indemnification for liabilities arising under the Securities Act may be permitted to
directors, officers and controlling persons of the Registrant pursuant to the foregoing provisions,
or otherwise, the Registrant has been advised that in the opinion of the Securities and Exchange
Commission such indemnification is against public policy as expressed in the Securities Act and is,
therefore, unenforceable. In the event that a claim for indemnification against such liabilities
(other than the payment by the Registrant of expenses incurred or paid by a director, officer or
controlling person of the Registrant in the successful defense of any action, suit or proceeding)
is asserted by such director, officer or controlling person in connection with the securities being
registered, the Registrant will, unless in the opinion of its counsel the matter has been settled
by controlling precedent, submit to a court of appropriate jurisdiction the question whether such
indemnification by it is against public policy as expressed in the Securities Act and will be
governed by the final adjudication of such issue.
Table of Contents
SIGNATURES
Pursuant to the requirements of the Securities Act of 1933, as amended (the "Securities Act"),
the registrant certifies that it has reasonable grounds to believe that it meets all of the
requirements for filing on Form S-8 and has duly caused this Registration Statement to be signed on
its behalf by the undersigned, thereunto duly authorized, in the City of Denver, State of Colorado,
on this 28
th
day of September, 2010.
CORESITE REALTY CORPORATION
By:
/s/ Thomas M. Ray
Name:
Thomas M. Ray
Title:
President
Pursuant to the requirements of the Securities Act, this Registration Statement has been
signed by the following persons in the capacities and on the dates indicated.
Signature
Title
Date
/s/ Thomas M. Ray
Thomas M. Ray
President and Director
September 28 2010
(Principal Executive Officer)
/s/ Deedee M. Beckman
Deedee M. Beckman
Treasurer and Chief Financial Officer
September 28, 2010
(Principal Financial Officer and
Principal Accounting Officer)
/s/ James A. Attwood, Jr.
James A. Attwood, Jr.
Director
September 28, 2010
/s/ Michael R. Koehler
Michael R. Koehler
Director
September 28, 2010
/s/ Robert G. Stuckey
Robert G. Stuckey
Director
September 28, 2010
/s/ Paul E. Szurek
Paul E. Szurek
Director
September 28, 2010
/s/ J. David Thompson
J. David Thompson
Director
September 28, 2010
/s/ David A. Wilson
David A. Wilson
Director
September 28, 2010
Table of Contents
EXHIBIT INDEX
Exhibit
Description
4.1
Articles of Amendment and Restatement of CoreSite Realty
Corporation (Incorporated by reference to Exhibit 3.1 to the
Registrant's Registration Statement on Form S-11/A dated September
22, 2010 (Registration No. 333-166810)).
4.2
Amended and Restated Bylaws of CoreSite Realty Corporation
(Incorporated by reference to Exhibit 3.2 to the Registrant's
Registration Statement on Form S-11/A dated September 22, 2010
(Registration No. 333-166810)).
5.1
Opinion of Venable LLP, with respect to the legality of the shares
being registered (filed herewith).
10.1
2010 Equity Incentive Award Plan (Incorporated by reference to
Exhibit 10.2 to the Registrant's Registration Statement on Form
S-11/A dated September 22, 2010 (Registration No. 333-166810)).
23.1
Consent of KPMG LLP (filed herewith).
23.2
Consent of Venable LLP (included in Exhibit 5.1).