4 W 21St St

A 17-story, 42-unit full-service residential building completed in 2005 and attributed to architect Hugh Hardy, the property reads as a modern loft-style condominium in Manhattan’s Flatiron district. Unit mix skews toward spacious one- and two-bedroom layouts with a limited number of large four-bedroom homes and multiple penthouse-level configurations. Interiors favor lofty proportions: high ceilings, floor-to-ceiling windows, wide-plank dark oak floors, and open-plan living and dining areas anchored by contemporary Poliform Varenna kitchens with Sub-Zero and Miele appliances. Bathrooms commonly include marble or honed stone finishes, double vanities, soaking tubs and radiant-heated features; several homes include walk-in closets, separate dining rooms, and in-unit laundry. Common facilities are designed for everyday convenience and family life: 24-hour doorman/concierge, a fully equipped fitness center, landscaped 2,500+ sq ft courtyard with a children’s play area, roof deck, storage and on-site garage parking. The building operates as a condop with condo rules—offering flexible ownership and rental policies including pets, pied-à-terres, subletting and co-purchasing—with an on-site live-in superintendent. Located a short walk from Madison Square Park, Union Square, Eataly and multiple transit lines, the building combines contemporary architectural presence with strong neighborhood retail, dining, and market access.