Imagine an online social network that’s all about buildings. Architects, contractors, and engineers can connect with future clients and subcontractors, give and receive referrals, and even get RFPs and submit bids right in the same platform. Property managers and building owners can show off their retrofit projects and rental spaces.

At the same time, prospective tenants can click a button to compare the energy performance of a whole group of properties in the same neighborhood. Occupants can praise—or kvetch about—the buildings where they work.