The Healey administration announced a new plan Monday to make more than 450 acres of state-owned land available for housing development.

The land could support as many as 3,500 new housing units, officials said. Vacant court buildings, hospitals, college facilities, and even the former site of the state’s oldest prison could soon be converted into housing. The administration is planning to make 17 new sites available to developers over the next 12 months, issuing 10 requests for proposals and auctioning off another seven sites in September.

The announcement comes as Massachusetts residents continue to feel the burden of exorbitant housing costs and as Gov. Maura Healey gears up for what promises to be a bruising reelection campaign. New polling results from the University of New Hampsh

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