24 CFR 850.153: Rent control.

A project constructed or substantially rehabilitated with a housing development grant is not subject to State or local rent control unless the rent control requirements or agreements (a) (1) were entered into under a State law or local ordinance of general applicability that was enacted and in effect in the jurisdiction before November 30, 1983 and (2) apply generally to rental housing projects not assisted under the Housing Development Grant Program, or (b) are imposed under this subpart. State and local rent controls expressly preempted by this section include, but are not limited to, rent laws or ordinances, rent regulating agreements, rent regulations, occupancy agreements, or financial penalties for failure to achieve certain occupancy or rent projections.