French insurer AXA next year will move as many as 850 employees to Jersey City after the insurance provider signed a lease for over 240,000 square feet at Brookfield Properties 1 million square-foot tower at 525 Washington St.

The Post has also learned that nearly 150,000 square feet of AXA’s current 800,000 feet at 1290 Sixth Ave., known as the Equitable Building, is expected to be filled by real estate firm Cushman & Wakefield, which is negotiating a move of its headquarters from Black Rock at 51 W. 52nd St.