The closest position he's advocating for is to freeze the rent stabilization rate for 5 years while massively ramping up the construction of new apartments to bring rental costs down.
Much of the pushback about Mamdani seems to be a fundamental misunderstanding of the difference betwene "rent control" and "rent stabilization". I think it's extremely rare to see a politician understand the supply/demand aspect of housing costs so well. He really seems to understand these dynamics, certainly better than anyone he's running against.