If you’ve got $14.5 million to invest, and you’d like living in Chelsea, you should grab this loft at 213 West 23rd Street right away. Because someone will. Lofts–even expensive architect-designed ones–make a stunning first impression but often disappoint when it comes to livability. This space, however–in the landmarked former home of the McBurney YMCA, whose gymnasium and running track make up the living areas–is a winner. Designed by Annabelle Selldorf, with interiors by Jeffrey Beers, this remarkable duplex spans a full 7,000 square feet, split between two levels with a soaring 29-foot-high living space at the center. Rooms–including four bedrooms–are organized in an intelligent and gracious plan for glamorous entertaining as well as maximum comfort and privacy.