AI customer support firm Sierra has leased 94,145 square feet at Rockrose Development's 11 East 26th Street in Midtown South. The deal follows Sierra's May 2025 announcement to establish a New York City office presence. The lease size places Sierra among significant office tenants in the Manhattan market, where tech companies continue to expand their physical footprints despite remote work trends.
Rockrose Development's Midtown South property houses the new tenant as commercial real estate demand from the AI sector accelerates. The transaction reflects broader patterns of technology firms securing large blocks of premium office space in Manhattan's core markets. Location at 11 East 26th Street positions Sierra near the competitive tech hub that defines the Flatiron and Midtown South districts.
The lease details emerge from Colliers' monthly Manhattan office report, providing market participants with data on tenant movement and space absorption in a sector watching AI adoption reshape office needs. The deal size and location underscore how AI-focused businesses are now anchoring themselves in traditional Manhattan submarkets rather than emerging alternatives.