| http://www.w3.org/ns/prov#value | - Rooftops are hotIn a city where land is a premium, buildings are increasingly looking skyward to build new apartments to take in some extra cash, as well as for places to put new recreational amenities or even for the latest eco-friendly projects.When co-ops are in need of cash, buildings are selling roof rights and building magnificent duplexes and penthouses, said Marc Spector, principal of ar
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