Probably on the order of a few to ~10 billion a month directly via apartments. Not counting secondary effects due to costs on business rent and wages to pay personal rent, nor tertiary effects like increased tax burden spent on homeless, subsidies for 'affordable housing', etc.

est 1-3 million renters @ avg $1,000 /month excess rent over fair value due to government enforced shortages. Personally it boggles my mind how this isn't the single issue among the relevant voting bloc.