Market Research - Supply / Demand

[Jung Won Kim]

Hello, where can I find data on how many apartment units/buildings are in a specific city, such as Tulsa, OK for instance? I would also like to see overall city vacancies in the past few years along with building permits issued for 5+ unit residential buildings. I've heard I could find these info on census.gov, but have had trouble finding the relevant info there. Any suggestions would be greatly appreciated.