Boston officials are hoping to again push the envelope on green building, asking developers to design and build small communities of ultra-efficient buildings that collectively will produce more energy than they consume.

This week Boston began accepting proposals from developers to build an “E+ Community” on 11 vacant city-owned parcels in Mission Hill. The 1.3 acres of land, located on Parker and Terrace streets, would be filled with a mix of dozens of housing units and communal gardens, and could include space for retail, commercial, or light industrial use.

The city will make the land available for minimum price of $488,000.

The site can be divided into two sections — with one about three times larger than the other — and developers can bid for one or both sites. Read about the full project at