AI customer support firm Sierra has leased 94,145 square feet at Rockrose Development's 11 East 26th Street in Midtown South. The deal marks Sierra's expansion into New York City following its May 2025 announcement of plans to establish a local presence.
The lease signals continued corporate demand for office space in Manhattan's Midtown South submarket, a neighborhood that has attracted tech and AI companies seeking alternative locations to traditional Midtown corridors. Rockrose Development, a major New York real estate player, secured the tenant through what Colliers reports as a notable deal in the monthly Manhattan office market.
Details on lease terms, including rental rates and occupancy timeline, remain undisclosed. The transaction reflects broader trends of AI and software companies expanding their footprint in New York despite hybrid work models reshaping office demand across the city. Sierra's commitment to nearly 100,000 square feet suggests confidence in maintaining substantial on-site operations for its customer support platform business.