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The exterior of Front and York, which is rising on a former Jehovah's Witnesses parking lot.

The roof-level pool will come modeled off those of private membership clubs.

It sounds like the kind of perk that couldn’t exist within cramped city limits: a 25,000-square-foot private park.

That’s the size of five basketball courts combined.

This massive green space is just one part of the 150,000 square feet of amenities that will be on offer at Front and York, a 1.1-million-square-foot mixed-use development rising in Dumbo, The Post can exclusively report.

The mere scale of the planned green space, which will only be accessible to Front and York residents, makes it among the largest private parks in Brooklyn.

Designed by Michael Van Valkenburgh Associates — who were responsible for Brooklyn Bridge Park — and accessible from two lobbies, it will be filled with mature trees and diverse plantings, as well as bench seating. Most of all, the park will be tucked away far from the Brooklyn neighborhood’s crowds.

Front and York, which is replacing a vacant parking lot at 85 Jay St. that was formerly owned by the Jehovah’s Witnesses, will also include a rooftop pool.

Modeled after members-only clubs (a la Soho House), the pool will be surrounded by cabanas with curtain draws and plush loungers. Brand-new renderings show views of Lower Manhattan over the Manhattan Bridge.

Elsewhere around the two-tower development — designed by Morris Adjmi and co-developed by CIM Group and LIVWRK — residents will also have access to wine rooms, private dining areas and co-working spaces.

Front and York, anticipated to be “substantially” complete in 2021, will house 408 condos and 320 rentals. Prices are not yet available.