Sustainable--Economically and Environmentally
Global warming is becoming such a core issue that for a project to be attractive economically it needs to make sense environmentally.
Economically sustainable is environmentally sustainable.
I don't see any other option--getting the numbers to work environmentally makes for a more attractive project, and is the right thing to do.
Buildings contribute over 60% of total carbon dioxide emissions during their lifecycle. Learning how to build and operate for a minimal environmental footprint is essential. As a builder and developer, I see no other way to build. You are creating a more attractive asset--for neighbors, investors, tenants, and owners.