Simpson Thacher & Bartlett has locked in the largest office lease signed in Manhattan during May, securing 916,000 square feet at 570 Fifth Avenue, Extell Development's flagship tower. The corporate law firm, known for handling high-stakes M&A and private equity work, filed the lease memorandum in property records.
This deal represents a major win for Extell's mixed-use development on Fifth Avenue, a prime Midtown location that commands premium rents. The tower blends office, retail, and residential uses. For Simpson Thacher, the lease signals confidence in Manhattan's office market despite ongoing hybrid work trends that have pressured demand across the city.
The size of this commitment—916,000 square feet—makes it a flagship occupancy for a single tenant. Law firms typically consolidate operations in key markets, and this footprint suggests Simpson Thacher is making Manhattan its headquarters or a major regional hub. The deal underscores that top-tier professional services firms continue to invest in prime office locations when the space and location match their needs.
For Extell, this lease provides long-term revenue stability and validates the development's market positioning. 570 Fifth Avenue sits in one of Manhattan's most sought-after office corridors, competing with other high-end properties. Securing a tenant of Simpson Thacher's caliber reduces vacancy risk and likely anchors smaller leases from other firms seeking proximity to a legal powerhouse.
Market observers note that while Manhattan's office sector faces headwinds, deals this large still happen when buildings offer superior locations, Class A amenities, and flexible layouts. This lease reflects selective market strength in trophy properties rather than broad recovery across the sector.
For prospective tenants evaluating Manhattan office space, this deal suggests that institutional-grade buildings in prime locations maintain pricing power. For building owners, it demonstrates that the right anchor