When will the Bloomberg administration finally do something about one of the biggest property tax delinquencies in this town — the Yankee Stadium parking garages?

Bronx Parking Development Company LLC, the nonprofit firm that Bloomberg’s aides handpicked and financed in 2007 to build and operate the 9,000-space garage system, currently owes the city more than $42 million in back rent, taxes and interest, records obtained by the Daily News show.