MIT has proposed a new zoning district PUD-5 (“Planned Unit Development 5”) that includes most MIT properties east of Ames Street in the Kendall Square area, as well as One Broadway (E70), a commercial office building north of Main Street at the northeast extreme of the district. The district would have a maximum height of 300 feet, though most areas of the district would be restricted to 250 feet, and some to 150 feet. MIT anticipates up to 1.9 million square feet of additional space within the district, including 800,000 square feet of academic and research space, 880,000 square feet of commercial space, with the remainder split between retail and residential.