Image courtesy of SGA and DREAM Collaborative

Fallon Co. has filed updates to its proposed 812,000-square-foot life science research and development building in Charlestown’s Sullivan Square that include a pledge to explore sharing the project’s parking with future developments nearby.

The 66 Cambridge St. development is being designed with around 10,000 square feet of ground-floor commercial space, a two-floor classroom space for Cambridge nonprofit Just-a-Start to train Boston-area residents for biotech careers and a 41,000-square-foot public plaza and walkway connecting its main entrance to Cambridge Street and the MBTA’s Sullivan Square Orange Line and bus station, according to a draft project impact report Fallon filed with the Boston Planning & Development Agency last week.

The building is being developed by a joint venture between Fallon and Owens Cos., the oldest minority-owned and operated company in New England.

Boston officials pushed back on Fallon’s and Owens’ original plans for 646 parking spaces a the building so close to a subway station. In its latest iteration, the developers have shrunk the underground parking garage by over 150 spaces, to 482. And, with the BPDA’s nearly-finalized PLAN: Charlestown recommending an eventual reduction in the neighborhood’s parking ratio to 0.4 per 1,000 square feet of life science and office space to keep traffic down, the developers wrote they will “commit to re-evaluate on-site parking supply and demand” once eventual improvements planned for the Orange Line and a sweeping modernization of the T’s bus network are implemented in the next few years.

In addition, Fallon and Owens wrote they will “explore whether any available sharing or reuse of parking spaces that will not be needed to meet the 66 Cambridge development’s parking demands may support nearby projects/uses with the goal of reducing new parking construction in the area.”