Alden Global Capital founder Randall Smith listed his co-op penthouse in Manhattan this winter, according to Dirt. The Park Avenue property comes to the open market with an asking price of $17.5 million.

The triplex unit is located in a Lenox Hill building that was completed in 1954. It contains five bedrooms and five baths, with the bedrooms distributed across two levels. Details throughout achieve a fine balance between period elegance and the contemporary; there’s a touch of classical by way of Doric columns, and suggestions of 1920s glamour, but the overall feel is a subtle one.

The rooftop space is dedicated to a large terrace that features a lengthy solarium as a centerpiece, an astonishing evocation of space and liberation. The first level features a bedroom which could be used for staff quarters, as well as a great room for entertaining that’s serviced by a wet bar. The middle level is the primary, a labyrinthine series of long halls and rooms that include specialty spaces: a service area, a gym, a sitting room, and a library.

The living room and connected dining room occupy one side of the floor; the former measures in at 31 feet by 15 feet, the latter 15 by 12.6. The master bedroom, ensconced in a corner, measures 12 feet by 9.6 feet.