Cost of

===== Cost of reusement =====
anon 1: Your better off making new apartments. Old buildings are a huge hassle. You have to fix old pipes, shingles on roof, pavement, walls, mold, tiles, etc.
anon 2: as a former worker for a remodeling contractor, i concur. running new wires in old attics is hot & itchy. I'm small enough to fit between the rafters so it was up to me.