Randy Mastro, Mayor Adams’ powerful top deputy at City Hall, is trying to find a way to block a controversial plan to build a housing complex in the Bronx for ex-cons with serious health problems — even though the mayor has been a big supporter of the project, according to sources familiar with the matter.

The exact motive for Mastro’s push against the project, known as “Just Home,” is unclear. But it comes as the project continues to draw intense opposition from the neighboring community in Morris Park, where Adams — who’s facing a very difficult path to a second term — could potentially pick up political support for November’s election.

The East Bronx neighborhood has trended increasingly conservative in recent election cycles, giving Adams, a right-wing Democrat, a possible politi

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