On October 5, 2011, the MBTA Board of Directors awarded S&R Enterprises, Inc., the construction services contract in the amount of $29,229,184 for the construction of a new MBTA Orange Line Station in conjunction with the Assembly Square redevelopment district. The Assembly Square redevelopment district in Somerville is the site of a proposed large-scale, mixed-use redevelopment project of 2,100 residential units, more than 2.75 million square feet of retail and office space, and a 200-room hotel. The new Orange Line station at this redevelopment area between Wellington and Sullivan Square Stations is planned to provide regional transit access and an alternative to auto traffic. The funding for the new station has been established through a public/private partnership with state and federal agencies and the developer Federal Realty Investment Trust.
Construction of Assembly Station began in April 2012. By February 2013, the project completed significant reconstruction of track, rail, and signal work, as well as track infrastructure to create space for the new Assembly Station's platforms. Major portions of this work as well as concrete pile installation to support the tracks and platforms has been performed, and will continue to be, during weekend diversions between Oak Grove and Sullivan Square Stations. Track work completion was accelerated due to "early access nights," in which subway service was suspended beginning 9:00 p.m. through the end of service, Sundays through Thursdays. Weekend diversions, based on the scope of work involved, are scheduled through March 2013 with early access scheduled in June 2013. The MBTA will notify patrons of a scheduled diversion at least two weeks prior through service advisories posted in Orange Line stations and online at mbta.com, public announcements within stations, and reminders via T-Alerts and Twitter @mbtagm.
The project is scheduled to be completed in approximately Fall 2014.