More about this “superlative” apartment in a second; first, how would you like to work out with David Kirsch, personal trainer to stars such as Heidi Klum and Liv Tyler? Because you’ll find him in the fitness center of this luxury condo building on East 26th Street. Just buy your way into this 17th-floor, custom-built 6,137-square-foot loft, which boasts 14-foot ceilings and giant windows with sweeping views of the city and Madison Square Park. There are five bedrooms and six bathrooms, plus a massive designer kitchen and entertaining rooms — all in a heavily serviced and highly amenitized building that includes, in addition to the Kirsch gym, a playroom, wine storage and a tasting room.

Contact: 212-696-1526