There is non-zero cost to dealing with a renter. If a landlord is refusing to rent out a price controlled unit, it is telling about how far off from market that price is at.

Enduring price controls are simply bad policy. All for measures that give renters more price protections beyond the initial lease term, but they shouldn't be perpetual. E.g., tenant has right to three renewals beyond current term of lease with rent increase capped at X%.