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<p align="center" style="margin:0in 0in .0001pt;text-align:center;"><b><font size="5" face="Times New Roman" style="font-size:18.0pt;font-weight:bold;">UNITED STATES<br> SECURITIES AND EXCHANGE COMMISSION</font></b></p>
<p align="center" style="margin:0in 0in .0001pt;text-align:center;"><b><font size="2" face="Times New Roman" style="font-size:10.0pt;font-weight:bold;">Washington, D.C. 20549</font></b></p>
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<p align="center" style="margin:0in 0in .0001pt;text-align:center;"><b><font size="5" face="Times New Roman" style="font-size:18.0pt;font-weight:bold;">FORM&nbsp;8-K</font></b></p>
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<p align="center" style="margin:0in 0in .0001pt;text-align:center;"><b><font size="3" face="Times New Roman" style="font-size:12.0pt;font-weight:bold;">CURRENT REPORT<br> Pursuant to Section&nbsp;13 or 15(d)&nbsp;of<br> the Securities Exchange Act of 1934</font></b></p>
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<p align="center" style="margin:0in 0in .0001pt;text-align:center;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">Date of Report (Date of earliest event reported)<b> September&nbsp;16, 2013</b></font></p>
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<p align="center" style="margin:0in 0in .0001pt;text-align:center;"><b><font size="5" face="Times New Roman" style="font-size:18.0pt;font-weight:bold;">AVALONBAY COMMUNITIES,&nbsp;INC.</font></b></p>
<p align="center" style="margin:0in 0in .0001pt;text-align:center;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">(Exact Name of Registrant as Specified in Its Charter)</font></p>
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<p align="center" style="margin:0in 0in .0001pt;text-align:center;"><b><font size="2" face="Times New Roman" style="font-size:10.0pt;font-weight:bold;">Maryland</font></b></p>
<p align="center" style="margin:0in 0in .0001pt;text-align:center;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">(State or Other Jurisdiction of Incorporation)</font></p>
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<p align="center" style="margin:0in 0in .0001pt;text-align:center;"><b><font size="2" face="Times New Roman" style="font-size:10.0pt;font-weight:bold;">1-12672</font></b></p>    </td>
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<p align="center" style="margin:0in 0in .0001pt;text-align:center;"><b><font size="2" face="Times New Roman" style="font-size:10.0pt;font-weight:bold;">77-0404318</font></b></p>    </td>   </tr>
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<p align="center" style="margin:0in 0in .0001pt;text-align:center;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">(Commission File Number)</font></p>    </td>
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<p align="center" style="margin:0in 0in .0001pt;text-align:center;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">(I.R.S. Employer Identification No.)</font></p>    </td>   </tr>  </table>
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<p align="center" style="margin:0in 0in .0001pt;text-align:center;"><b><font size="2" face="Times New Roman" style="font-size:10.0pt;font-weight:bold;">671 N. Glebe Road, Suite&nbsp;800, Arlington,   Virginia</font></b></p>    </td>
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<p align="center" style="margin:0in 0in .0001pt;text-align:center;"><b><font size="2" face="Times New Roman" style="font-size:10.0pt;font-weight:bold;">22203</font></b></p>    </td>   </tr>
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<p align="center" style="margin:0in 0in .0001pt;text-align:center;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">(Address of Principal Executive Offices)</font></p>    </td>
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<p align="center" style="margin:0in 0in .0001pt;text-align:center;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">Registrant&#146;s telephone number, including area code <b>(703) 329-6300</b></font></p>
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<p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">Check the appropriate box below if the Form&nbsp;8-K filing is intended to simultaneously satisfy the filing obligation of the registrant under any of the following provisions:</font></p>
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<p style="margin:0in 0in .0001pt .25in;text-indent:-.25in;"><font size="2" face="Wingdings" style="font-size:10.0pt;">o</font><font size="1" style="font-size:3.0pt;">&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160; </font><font size="2" style="font-size:10.0pt;">Written communications pursuant to Rule&nbsp;425 under the Securities Act (17 CFR 230.425)</font></p>
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<p style="margin:0in 0in .0001pt .25in;text-indent:-.25in;"><font size="2" face="Wingdings" style="font-size:10.0pt;">o</font><font size="1" style="font-size:3.0pt;">&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160; </font><font size="2" style="font-size:10.0pt;">Soliciting material pursuant to Rule&nbsp;14a-12 under the Exchange Act (17 CFR 240.14a-12)</font></p>
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<p style="margin:0in 0in .0001pt .25in;text-indent:-.25in;"><font size="2" face="Wingdings" style="font-size:10.0pt;">o</font><font size="1" style="font-size:3.0pt;">&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160; </font><font size="2" style="font-size:10.0pt;">Pre-commencement communications pursuant to Rule&nbsp;14d-2(b)&nbsp;under the Exchange Act (17&nbsp;CFR&nbsp;240.14d-2(b))</font></p>
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<p style="margin:0in 0in .0001pt .25in;text-indent:-.25in;"><font size="2" face="Wingdings" style="font-size:10.0pt;">o</font><font size="1" style="font-size:3.0pt;">&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160; </font><font size="2" style="font-size:10.0pt;">Pre-commencement communications pursuant to Rule&nbsp;13e-4(c)&nbsp;under the Exchange Act (17&nbsp;CFR&nbsp;240.13e-4(c))</font></p>
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<p style="margin:0in 0in .0001pt 1.0in;text-indent:-1.0in;"><b><font size="2" face="Times New Roman" style="font-size:10.0pt;font-weight:bold;">ITEM 8.01</font></b><b><font size="1" style="font-size:3.0pt;font-weight:bold;">&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160; </font></b><b><font size="2" style="font-size:10.0pt;font-weight:bold;">Other Events.</font></b></p>
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<p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">On September&nbsp;16, 2013, AvalonBay Communities,&nbsp;Inc. (the &#147;Company&#148;) priced a public offering (the &#147;Offering&#148;) of an aggregate of $400,000,000 principal amount of its 3.625% Medium Term Notes due 2020 (the &#147;Notes&#148;).&#160; The offering was made pursuant to a Pricing Supplement dated September&nbsp;16, 2013, a Prospectus Supplement dated September&nbsp;6, 2012 and a prospectus dated February 27, 2012 relating to the Company&#146;s Shelf Registration Statement on Form&nbsp;S-3 (File No.&nbsp;333-179720).&#160; The Terms Agreement, dated September&nbsp;16, 2013, by and among the Company and the Agents named therein, is filed herewith as Exhibit&nbsp;1.1.</font></p>
<p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
<p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">The Notes were issued under an Indenture between the Company and The Bank of New York Mellon, as trustee, dated as of January&nbsp;16, 1998, as supplemented by a First Supplemental Indenture dated as of January&nbsp;20, 1998, a Second Supplemental Indenture dated as of July&nbsp;7, 1998, an Amended and Restated Third Supplemental Indenture dated as of July&nbsp;10, 2000 and a Fourth Supplemental Indenture dated as of September&nbsp;18, 2006.</font></p>
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<p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">The Notes bear interest from September&nbsp;20, 2013, with interest on the Notes payable semi-annually on April 1 and October 1, beginning on April 1, 2014.&#160; The Notes will mature on October 1, 2020.&#160; The Company will use the aggregate net proceeds, after underwriting discounts and other transaction-related costs, of approximately $396,212,000 from the sale of the Notes to reduce indebtedness outstanding under its $1,300,000,000 unsecured revolving credit facility and for general corporate purposes, which may include the acquisition and development and redevelopment of apartment communities and repayment and refinancing of other indebtedness.&#160; Settlement occurred on September&nbsp;20, 2013.</font></p>
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<p style="margin:0in 0in .0001pt;"><b><font size="2" face="Times New Roman" style="font-size:10.0pt;font-weight:bold;">ITEM 9.01&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160; Financial Statements and Exhibits.</font></b></p>
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<p style="margin:0in 0in .0001pt .55in;text-indent:-.5in;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">(d)</font><font size="1" style="font-size:3.0pt;">&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160; </font><font size="2" style="font-size:10.0pt;">Exhibits.</font></p>
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<p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">1.1*</font></p>    </td>
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<p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">Terms   Agreement, dated September&nbsp;16, 2013.</font></p>    </td>   </tr>
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<p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">Legal   Opinion of Goodwin Procter LLP, dated September&nbsp;20, 2013.</font></p>    </td>   </tr>
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<p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">Consent   of Goodwin Procter LLP (included in Exhibit&nbsp;5.1).</font></p>    </td>   </tr>  </table>
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<p style="margin:0in 0in .0001pt .25in;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">*&#160; Filed herewith.</font></p>
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<p align="center" style="margin:0in 0in .0001pt;text-align:center;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">2<a name="PB_2_142437_7056"></a></font></p>
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<p align="center" style="margin:0in 0in .0001pt;text-align:center;"><u><font size="2" face="Times New Roman" style="font-size:10.0pt;">SIGNATURES</font></u></p>
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<p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">Pursuant to the requirements of the Securities Exchange Act of 1934, the Registrant has duly caused this report to be signed on its behalf by the undersigned hereunto duly authorized.</font></p>
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<p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">AVALONBAY   COMMUNITIES,&nbsp;INC.</font></p>    </td>   </tr>
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<p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">September&nbsp;20,   2013</font></p>    </td>
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<p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">By:</font></p>    </td>
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<p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">/s/   Thomas J. Sargeant</font></p>    </td>   </tr>
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<p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">Name:</font></p>    </td>
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<p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">Thomas   J. Sargeant</font></p>    </td>   </tr>
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<p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">Title:</font></p>    </td>
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<p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">Chief   Financial Officer</font></p>    </td>   </tr>  </table>
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<p align="center" style="margin:0in 0in .0001pt;text-align:center;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">3<a name="PB_3_142533_5335"></a></font></p>
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{"company-data": {"conformed-name": "AVALONBAY COMMUNITIES INC", "cik": "0000915912", "assigned-sic": "6798", "irs-number": "770404318", "state-of-incorporation": "MD", "fiscal-year-end": "1231"}, "filing-values": {"form-type": "8-K", "act": "34", "file-number": "001-12672", "film-number": "131106523"}, "business-address": {"street1": "671 N. GLEBE ROAD", "street2": "SUITE 800", "city": "ARLINGTON", "state": "VA", "zip": "22203", "phone": "7033296300"}, "mail-address": {"street1": "671 N. GLEBE ROAD", "street2": "STE 800", "city": "ARLINGTON", "state": "VA", "zip": "22203"}, "former-company": [{"former-conformed-name": "AVALON BAY COMMUNITIES INC", "date-changed": "19980618"}, {"former-conformed-name": "BAY APARTMENT COMMUNITIES INC", "date-changed": "19931208"}]}
UNITED STATES
SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549
FORM 8-K
CURRENT REPORT
Pursuant to Section 13 or 15(d) of
the Securities Exchange Act of 1934
Date of Report (Date of earliest event reported)
September 16, 2013
AVALONBAY COMMUNITIES, INC.
(Exact Name of Registrant as Specified in Its Charter)
Maryland
(State or Other Jurisdiction of Incorporation)
1-12672
77-0404318
(Commission File Number)
(I.R.S. Employer Identification No.)
671 N. Glebe Road, Suite 800, Arlington,   Virginia
22203
(Address of Principal Executive Offices)
(Zip Code)
Registrant's telephone number, including area code
(703) 329-6300
Check the appropriate box below if the Form 8-K filing is intended to simultaneously satisfy the filing obligation of the registrant under any of the following provisions:
o
Written communications pursuant to Rule 425 under the Securities Act (17 CFR 230.425)
o
Soliciting material pursuant to Rule 14a-12 under the Exchange Act (17 CFR 240.14a-12)
o
Pre-commencement communications pursuant to Rule 14d-2(b) under the Exchange Act (17 CFR 240.14d-2(b))
o
Pre-commencement communications pursuant to Rule 13e-4(c) under the Exchange Act (17 CFR 240.13e-4(c))
ITEM 8.01
Other Events.
On September 16, 2013, AvalonBay Communities, Inc. (the "Company") priced a public offering (the "Offering") of an aggregate of $400,000,000 principal amount of its 3.625% Medium Term Notes due 2020 (the "Notes").  The offering was made pursuant to a Pricing Supplement dated September 16, 2013, a Prospectus Supplement dated September 6, 2012 and a prospectus dated February 27, 2012 relating to the Company's Shelf Registration Statement on Form S-3 (File No. 333-179720).  The Terms Agreement, dated September 16, 2013, by and among the Company and the Agents named therein, is filed herewith as Exhibit 1.1.
The Notes were issued under an Indenture between the Company and The Bank of New York Mellon, as trustee, dated as of January 16, 1998, as supplemented by a First Supplemental Indenture dated as of January 20, 1998, a Second Supplemental Indenture dated as of July 7, 1998, an Amended and Restated Third Supplemental Indenture dated as of July 10, 2000 and a Fourth Supplemental Indenture dated as of September 18, 2006.
The Notes bear interest from September 20, 2013, with interest on the Notes payable semi-annually on April 1 and October 1, beginning on April 1, 2014.  The Notes will mature on October 1, 2020.  The Company will use the aggregate net proceeds, after underwriting discounts and other transaction-related costs, of approximately $396,212,000 from the sale of the Notes to reduce indebtedness outstanding under its $1,300,000,000 unsecured revolving credit facility and for general corporate purposes, which may include the acquisition and development and redevelopment of apartment communities and repayment and refinancing of other indebtedness.  Settlement occurred on September 20, 2013.
ITEM 9.01           Financial Statements and Exhibits.
(d)
Exhibits.
Exhibit No.
Description
1.1*
Terms   Agreement, dated September 16, 2013.
5.1*
Legal   Opinion of Goodwin Procter LLP, dated September 20, 2013.
23.1
Consent   of Goodwin Procter LLP (included in Exhibit 5.1).
*  Filed herewith.
2
SIGNATURES
Pursuant to the requirements of the Securities Exchange Act of 1934, the Registrant has duly caused this report to be signed on its behalf by the undersigned hereunto duly authorized.
AVALONBAY   COMMUNITIES, INC.
September 20,   2013
By:
/s/   Thomas J. Sargeant
Name:
Thomas   J. Sargeant
Title:
Chief   Financial Officer
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