About the Building

635 Sixth Avenue is a distinctive office building in Manhattan’s Flatiron and Chelsea corridor, combining historic Beaux-Arts architecture with contemporary office interiors and upgraded tenant amenities. Positioned along Sixth Avenue near West 19th Street, the property offers the character of a classic Midtown South building with the ceiling heights, natural light, and open layouts sought by modern office users.

The building is especially notable for its approximately 12,000-square-foot full floors, which provide companies with efficient, self-contained office environments. Ceiling heights reach approximately 15 feet, while large windows along the perimeter bring strong natural light into the workspace. The broad floor plates can support a range of layouts, from open-plan creative offices to more traditional configurations with private offices, conference rooms, lounges, collaboration areas, and pantries.

A recent improvement program has modernized the tenant experience throughout the property. The building features a newly renovated lobby designed by STUDIOS, combining contemporary finishes with the building’s historic architectural character. Tenants also have access to a redesigned rooftop amenity with landscaped seating areas, shaded gathering spaces, and expansive views across Midtown South and Downtown Manhattan.
Representative floor plans demonstrate considerable flexibility. A sixth-floor test fit accommodates 66 workstations and 3 private offices, together with conference rooms, phone rooms, collaboration areas, lounge space, a pantry, wellness facilities, and support areas. Alternative layouts on the seventh floor range from more office-intensive configurations to higher-density plans accommodating more than 70 employees.

635 Sixth Avenue has attracted established technology, media, and business-services tenants, reflecting the building’s combination of architectural character and modern workplace functionality. Its location places tenants within easy walking distance of Chelsea, Flatiron, Union Square, and Madison Square Park, with a wide selection of restaurants, cafés, retail, fitness, and entertainment nearby.

Transportation is also a major advantage. Multiple subway lines are accessible along 14th Street and 23rd Street, while Penn Station, Grand Central Terminal, and other major transit hubs can be reached quickly from the surrounding neighborhood.

For companies searching for Flatiron or Chelsea office space, 635 Sixth Avenue offers large full-floor opportunities, high ceilings, substantial natural light, modernized common areas, a landscaped rooftop amenity, and the architectural character associated with Manhattan’s traditional Midtown South office market.