**AI Data Platform Chalk Signs Long-Term Lease in San Francisco’s Union Square**
Cushman & Wakefield has arranged a new long-term lease agreement at 55 Stockton Street, located in the heart of San Francisco’s Union Square. Chalk, a data platform focused on artificial intelligence and machine learning, has committed to 14,952 square feet of office space at the property.
The landlord, Zaber, was represented by Cushman & Wakefield’s Sam Wasserstein and Elena Saccone. Representing Chalk in the transaction were Pierce Neinken and Alexis Escaranio of Resource Commercial Real Estate.
“This lease is a significant milestone for Union Square, signaling its continued recovery,” said Sam Wasserstein. “Chalk’s arrival, alongside other recent office and retail leases, underscores the area’s revitalization and the strong appeal of 55 Stockton Street’s creative spaces and prime location. This property offers unparalleled access to a dynamic urban core, providing an inspiring and accessible environment where forward-thinking teams can truly thrive.”
Conveniently located just one block from public transit links including BART, MUNI, and the City Subway, 55 Stockton offers flexible office layouts geared toward companies that value creative space and ease of access.
Chalk’s move reaffirms Union Square’s growing appeal as a hub for innovative businesses, as the neighborhood continues its post-pandemic resurgence.


