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The Hartz Group, Inc.
Ownership
Owner Occupied and Managed
667 Madison Ave is owned, occupied, and managed by its original developer Leonard Stern, who keeps his office in the building and manages The Hartz Group, a large real estate, renewable energy, and investment company, along with his son Edward.
The Hartz Group is nearly 100 years old. Still closely held, the Sterns run the company with a focus on flexibility, adaptability, and an exceptionally strong balance sheet.

Contact
Howard Hersch
Vice Chairman
212.812.6020
howard.hersch@am.jll.com
Jonathan Fanuzzi
Managing Director
212.812.6044
jonathan.fanuzzi@am.jll.com
Brett Harvey
Senior Vice President
212.271.6400
brett.harvey@am.jll.com
Mort Schrader
Managing Director
212.812.6426
mort.schrader@am.jll.com
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