> You would also have no way (that I know of) of only selling to people like teachers, firefighters, etc because of fair housing laws. There’s may be an exception for military.

Isn't the San Francisco school district doing precisely this for teachers? I also recall reading that Stanford was securing housing nearby and 'selling' to faculty members by granting them loans with super generous mortgage payments, with the expectation that said faculty member will never actually pay off the mortgage.