MCLEAN, VA--(Marketwired - May 16, 2017) - Today, Freddie Mac (OTCQB: FMCC) announced it has released its quarterly update to the Multifamily Apartment Investment Market Index(SM) (AIMI(SM)), and has added Boston to the list as the 14th major metropolitan market covered. AIMI is a free online analytical tool that combines multifamily rental income growth, property price growth and mortgage rates to provide a single index that objectively measures multifamily market investment conditions.