A maisonette at exclusive 960 Fifth Ave. is hitting the market Thursday for $4.99 million.

The one-bedroom, 1½-bathroom spread in the Rosario Candela-designed building is the former home of Sister Parish, the late interior designer and socialite who famously decorated the Kennedy White House. The current seller is Texas-based racehorse owner Susie Mackie.

Susie and her late husband David bought the home for $2.93 million in 2013 from Patricia Altschul of Bravo’s “Southern Charm.”

The maisonette, which had been decorated by the late Mario Buatta for Altschul, has once again been completely renovated.

It now features a grand, double-size living room, a wood-paneled study, a chef’s kitchen and lots of paneled woodwork.

Building amenities include private dining rooms and a catering kitchen on the ground floor’s “Georgian Suite,” plus a gym and a landscaped roof garden shared with sister building 3 E. 77th St.

In 2014, Egyptian billionaire Nassef Sawiris paid a then-record $70 million for 960 Fifth’s penthouse, which had been owned by the late Seagram heir Edgar Bronfman Sr.

The listing broker is Jenny Lenz of Dolly Lenz Real Estate.