A 15th-floor unit at the Chelsea Mercantile is about to hit the market for $6.22 million.

The two- to three-bedroom unit features a stunning 1,400-square-foot terrace.

Past residents of the building, located at 252 Seventh Ave., include chef Bobby Flay, actress Katie Holmes and singer Lance Bass.

The listing brokers are Dolly and Jenny Lenz of Dolly Lenz Real Estate.

A six-floor, 22-foot-wide townhouse at 122 Waverly Place (above) is on the market for $16.95 million.

Outfitted by Cheryl Eisen’s Interior Marketing Group, it comes with an open staircase and a retractable skylight, and a double-height rear glass facade.

There’s also an indoor chef’s kitchen and an outdoor gas fire pit and a penthouse-level master suite.

The seller bought the brick and brownstone home, built in 1930, for $15.94 million in 2013.

The listing broker is Matthew Coleman, of Coleman Real Estate.