Mets owner Steve Cohen won’t allow an MLS neighbor to park for free on his lot.

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NYCFC is deep in negotiations for a new, 25,000-seat stadium and housing development neighboring the Mets’ Citi Field, but the MLS team’s ambitions are tangled up in Cohen’s plans for the same area, according to The City.

The club — which isn’t required to offer parking — wants to use Citi Field’s parking lot for its home games, which would require the Mets’ approval. But Cohen is looking to build a casino near Citi Field on 50 acres designated as park land — and is holding out approval on a parking agreement as leverage.