Harvey AI Expands Office Lease At One Madison Avenue In Manhattan To 185326 Square Feet

The property involved in this transaction is an office asset located on Madison Avenue in Manhattan, encompassing a total square footage of 185,326. The lease carries an asking rent of approximately $120 per square foot.

Summary of transaction details:

• Property Type: Office
• Transaction Amount: Not specified
• Address: Madison Avenue
• Market: Manhattan
• Landlord: Marc Holliday - SL Green
• Tenant: Winston Weinberg - Harvey AI
• Brokers: Joseph Messina, Todd Stracci, Paul Glickman, Alexander Chudnoff, Benjamin Bass & Diana Biasotti - JLL

The tenant, Winston Weinberg, is affiliated with Harvey AI, which has expanded its presence at One Madison Avenue, increasing its space significantly after an initial lease of 92,663 square feet in October. The deal has contributed to SL Green achieving approximately 900,000 square feet of leasing activity across its New York portfolio in the first quarter of 2026, indicating a strong leasing environment.