The party-loving bigwigs at the Park Avenue Armory are suing the state for “unlawfully depriving” them of a small basement room in the building where a child cadet group meets once a week after school.

Last week, The Post reported on allegations that the bosses at the Upper East Side nonprofit, the Seventh Regiment Armory Conservancy, turned the national landmark into their “own personal country club,” using it to host exclusive affairs like fashion shows and celeb-filled after-parties — even wedding celebrations for its staff on the nonprofit’s dime. 3

Now, they’re trying to overturn a bill signed last year by Gov. Hochul that prohibited them from kicking out the Knickerbocker Greys, calling it “a clear abuse of legislative power.”

The child cadets’ use of the room will in

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