DivcoWest, Blackstone Secure Anthropic's Full-Building Lease at 300 Howard, Plus 342 Howard

Anthropic agreed to occupy the entire 25-story tower at 300 Howard Street and the adjacent historic 342 Howard, a combined footprint of 484,000 square feet that anchors the Transbay South Financial District corridor being called "AI Alley." The buildings are owned and managed by a joint venture between DivcoWest and Blackstone Real Estate, and the lease announcement was circulated in a corporate press release on February 2, 2026.

The primary lease is for 300 Howard, a 466,000 square foot, Class A office tower described by DivcoWest as a "next-generation workplace" built for scale, collaboration, and long-term growth. The additional asset, 342 Howard, is a historic 18,000 square foot building immediately adjacent to the tower. DivcoWest’s LinkedIn post noted that the partners acquired 300 Howard in 2025, a detail not repeated in the press release.

Anthropic’s president and co-founder Daniela Amodei said, "With over 1,300 employees in the Bay Area and counting, I'm especially excited about what this growth means for the local community." DivcoWest’s Gregg Walker added, "San Francisco’s resurgence is being led by AI, and Anthropic’s decision to make a full-building commitment at 300 Howard reinforces our shared confidence in the city’s future. We’re thrilled to play a role in the revitalization of downtown and to build a long-term partnership together."

JLL brokers represented both sides of the transaction. Chris Roeder, Vice Chairman; Ted Davies, Senior Managing Director; and Carlye Parker, Senior Vice President represented the ownership. Felipe Gomez-Kraus and John Diepenbrock represented Anthropic. Trade reporting also identified Blackstone’s Perform Properties as the operating affiliate for the Blackstone retail and office portfolio in this deal.

Market significance is immediate. The press release and subsequent coverage described the lease as one of the largest office commitments in San Francisco’s history and, in some versions, "one of the largest single-building office commitments in San Francisco’s history." The deal underscores a broader trend: leading AI companies concentrating talent and office demand in downtown nodes, which market observers say is accelerating downtown revitalization.

For San Francisco residents, the deal could mean more daytime foot traffic in the Transbay area, increased demand for nearby restaurants, retail and transit capacity, and heightened competition for housing close to downtown jobs. Anthropic’s consolidation from nearby locations at 500 and 505 Howard into a single campus-like presence will concentrate its reported base of more than 1,300 Bay Area employees in the neighborhood.

Key commercial details remain undisclosed. The press release did not provide lease financials, lease term length, a move-in schedule, or specifics on tenant improvements and build-out timelines. Reporters and market participants will be watching for confirmation of the LinkedIn acquisition timeline, any planned renovations, and whether municipal incentives or permitting issues factor into Anthropic’s build-out.

The Anthropic lease at 300 and 342 Howard cements the Transbay area’s role in San Francisco’s tech ecosystem and offers a clear data point that AI companies are driving office demand. Next steps for local stakeholders will include monitoring how quickly staff return to downtown workspaces, how local businesses absorb increased demand, and whether similar large-scale commitments follow.