667 MAD


666 Madison Ave

Building Facts

  • NYC’s finest boutique office building
  • Located steps from Central Park
  • In the Plaza District

Building Features

  • Flexible floor plans
  • Stunning Central Park views
  • Best-in-class brand new pre-built installations
  • 24-7 HVAC
  • Exceptional transportation accessibility
  • Built in 1987
  • Renovated in 2018– Elevators & Fire Alarm System
  • Designed by Helpern Architects
  • Located at Madison Avenue & 61st Street
  • 667 Mad has 25 floors totaling 273,114 RSF
  • Slab heights: 13'-8" to 14'-7"


  • 24-7 tenant controlled water cooled package units on every floor


  • Three low-rise passenger elevator cars serve floors 2–11
  • Three high-rise passenger elevator cars serve floors 11–25
  • One service elevator


  • Verizon, AT&T, LightPath, Optimum and Cogent
  • Fiber optic communication available

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  • Fitness center
  • Golf simulator
  • Café-lounge
  • Conference center

Servcorp full service, staffed flexible office suites

To make a golf simulator reservation, (click here)




Hartz 667Mad Stack



neighborhood map




  • La Goulue
  • Serafina Always
  • Avra Madison Estiatorio
  • Le Bilbouquet
  • Il Mulino
  • Freds at Barneys
  • 540 Park
  • The Bar Room
  • Amaranth
  • Majorelle


  • Barneys
  • Tom Ford
  • Brioni
  • Schutz
  • Stuart Weitzman
  • Tod’s
  • Loro Piana
  • Celine
  • Moncler
  • The Apple Store


  • St. Regis
  • The Plaza
  • The Ritz
  • The Four Seasons
  • The Pierre
  • The Sherry-Netherland
  • The Lowell Hotel
  • The Regency
  • Hôtel Plaza Athénée
  • The Peninsula


  • Central Park
  • MoMA
  • The Frick
  • The Met Breuer
  • Carnegie Hall



art at 667

During your visit to 667 Mad, take a moment to discover the museum-quality art collected by The Hartz Group, Inc. Each piece offers a unique glimpse into history and holds significant value by the building’s owner, Chairman & CEO, Leonard Stern. 

A ten-foot-tall bronze Statue of Liberty, by Frédéric Auguste Bartholdi, stands at the building’s entrance to greet visitors. Lady Liberty was the first to greet Leonard Stern’s father, Max Stern, when he immigrated at Ellis Island in 1926. When Max caught glimpse of America’s greeter, he recalled a powerful thought:

“Now I am going to be free to achieve as much as I am able.”

- Max Stern

 He went on to realize the American dream.


Lady Liberty

Lady Liberty

Armour Exhibit

Armour Exhibit

Portrait of Washington

Portrait of Washington



This majestic building is sheathed with a granite facade enhanced by a decorative limestone trim.

Its detailed design offers unusually high ceilings with superb finishes.