The question of whether the idea of charging for parking via a parcel tax is asked. Along these lines, there might be an opportunity to charge for on-site parking,, but charge for off-site parking (e.g. over a freeway) that would be served by shuttles (eventually moving to autonomous shuttles).
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And here is an enlightening article on the cost of “free” parking in Philadelphia:
http://planphilly.com/articles/2017/08/18/there-s-no-such-thing-as-free-parking-in-philly-says-economist-who-calculated-how-much-off-street-parking-adds-to-housing-prices