 That means their rents increase according to the New York City Rent Guidelines Board orders for each new lease as well as according to orders by the New York Office of Rent Administration for, among other things, major capital improvements  and landlord hardship.Upon leaving Mitchell-Lama, the owners of rental buildings built since 1974 can raise rents without restriction.Tenants whose buildings had federally-subsidized "236" mortgages may qualify for federal "enhanced" vouchers, which allows them to pay at least what they were paying and no less than 30% of their income in rent, with a government paying the balance.