Bosses at the nonprofit Park Avenue Armory on the Upper East Side have turned the national landmark into their “own personal country club” — while fighting to kick out two dozen child cadets from the nation’s oldest afterschool program in its building, The Post has learned.

The nonprofit running the space – the Seventh Regiment Armory Conservancy – has been using the 145-year-old building to host exclusive affairs like fashion shows by Giorgio Armani, Marc Jacob and Oscar de la Renta and after-parties attended by the likes of Beyonce, Victoria Beckham and Orlando Bloom. 10

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While nonprofit executives rub elbows with boldfacers, they’ve neglected their mandate to preserve the historic site and, critics allege, fudge numbers to score public funding as it bleeds money.

In 2006, t

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