Parking minimums are zoning rules that require businesses and housing developments to build a minimum number of parking spaces regardless of actual demand. One standard space is roughly 300 square feet including access lane, enough square footage for a small apartment. These requirements exist because cities decided to guarantee car access, and the cost gets passed through as higher rents and higher prices for everyone, including people who don't own cars.
A federal incentive program for municipalities that eliminate parking minimums would let the market decide how much parking is actually needed. Businesses that need parking will provide it.
The hidden subsidy that every non-car-owner currently pays for everyone else's parking isn't a law of nature. It's a zoning choice. Incentivize municipalities to make a different one.