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SOMERVILLE — Walking around Assembly Row , you can see why Tom Menino and Marty Walsh would hate this place. This new mini-city, rising in the shadow of Boston, has been 15 years in the making and many parts of it will begin to open starting in the spring: restaurants, upscale outlet shops, apartments, office space, a hotel, a movie theater, a waterfront amphitheater, and the piece de resistance: the first new T stop in nearly three decades.
Last week, the $1.5 billion mega development landed its first major office tenant: Partners HealthCare. The Boston hospital chain will consolidate administrative operations from 14 locations across the region and move into its own complex, bringing 4,500 workers, of which 3,700 will come from Boston.