The 420-unit building, behind the Coney Island boardwalk, will complete the final phase of a trio  of properties BFC has brought to the once-underutilized blocks between West 16th and West 18th Street.

Leasing is brisk at 17 State St. near the Seaport since RFR Realty refinanced the harbor-facing, 571,000 square-foot office tower in January. The refi was one of three that RFR head Aby Rosen pulled off on previously strained properties — the other two were retail portions of 670 Sixth Ave. and 150 E. 72nd St.