There is no 304 Hartford Ave anymore or 302 Harford Ave for that matter.  These houses were sold in 2005, and 718 and 720 Huntington St home were built in their place in 2008.  This note is added on 720 Huntington St, and the unmarked home to the south is 718 Huntington St.  The icons of the homes are correct, just not the addresses.