An image from Google Maps showing the proposed site of a 113 unit 40B housing project at the corner of Coolidge Hill Road and Arlington Street. A developer has started the process to build a Chapter 40B residential project on a major intersection in East Watertown. Under the state law to encourage the building of affordable housing, 40B projects do not have to comply with many local zoning rules. The project is proposed for 19 Coolidge Hill Road, on the former E.H. Hinds Atlantic Plant property. The proposal, according to information submitted to the MassHousing Partnership (which oversees 40B projects), would have 113 rental units on the 0.9 acre lot, and would have 28 affordable units.