This Manhattan co-op owned by investment banker and former Secretary of the Treasury Steven Mnuchin moved into contract this spring. The Upper East Side unit had been listed at $27.75 million prior to being removed from the open market.

There are twelve rooms in the duplex, which is situated along the middle floors of a famous, Rosario Candela and Arthur Loomis Harmon-designed limestone building in Lenox Hill. It contains five bedrooms and seven baths, and a layout that places the shared spaces on the first level, beginning with an elegant gallery with a curving staircase floored in glossy natural stone. The upper-floor suite extends the length of the unit.

Among the residence’s more appealing rooms is the library, which features built-in shelving given a neoclassical treatment, plank oak floors, an original fireplace with a black marble surround, and hardwood wainscoting which appears to be mahogany.

The dining room is large for its purpose, measuring 26 feet across, but it is dwarfed by the 35-foot living room; fireplaces grace both. A combination kitchen and dayroom, a butler’s pantry, and a staff room and bath also populate the unit.