Simpson Thacher Inks Nearly 1M-SF Lease at Extell’s 570 Fifth Avenue, Topping May's Manhattan Deals

Corporate legal heavyweight Simpson Thacher & Bartlett has cemented the largest Manhattan office transaction recorded in May, officially signing a sprawling 916,000-square-foot lease at Extell Development’s upcoming skyscraper at 570 Fifth Avenue. The massive commitment provides a substantial vote of confidence in the Midtown office market, proving that top-tier firms remain eager to secure premium, modern workspaces.

According to Commercial Observer, a recently filed memorandum of lease confirms that the firm—well-known for its dominance in private equity and corporate transactions—is making a major spatial commitment to the new development. This transaction not only highlights the enduring flight-to-quality trend among elite professional services firms but also represents a pivotal leasing victory for Extell Development's flagship project.

Key Details

The parties involved in this headline-grabbing transaction are the tenant, global law firm Simpson Thacher & Bartlett, and the landlord, Extell Development. The agreement locks down 916,000 square feet of commercial real estate within the property located at 570 Fifth Avenue. Spanning nearly an entire block front at the corner of Fifth Avenue and West 46th Street, the building is poised to become a defining architectural addition to the Midtown skyline. While exact financial terms and the precise length of the lease have not been publicly disclosed, commitments of this magnitude typically span 15 to 20 years and carry aggregate values well into the billions of dollars over the life of the term. The deal acts as an anchor for the building as it progresses through its construction timeline.

Market Context

For commercial real estate professionals, Simpson Thacher's colossal footprint at 570 Fifth Avenue serves as a prime indicator of the ongoing bifurcation in the Manhattan office market. Legacy firms are continuing to consolidate operations into highly amenitized, Class-A towers, leaving older, functionally obsolete buildings behind. This specific transaction reinforces the trend that tenants are willing to pay steep premiums for brand-new construction that prioritizes sustainability, collaborative work environments, and state-of-the-art technology infrastructure.

This 916,000-square-foot transaction also provides robust momentum for the Midtown submarket, which has seen institutional leasing activity fluctuate amid shifts toward hybrid work models. By claiming the top spot for May's leasing volume, the deal absorbs a massive chunk of the borough's available pipeline space. Furthermore, an anchor commitment of this size drastically reduces the speculative risk for Extell, often making it easier for the developer to attract secondary tenants and secure favorable long-term financing. As major law firms and financial institutions continue to reshape their real estate footprints, 570 Fifth Avenue is now positioned as a premier destination for elite corporate tenants.