AI firms including Anthropic and OpenAI leased over one million square feet of London office space since early 2025. This activity represents approximately 7% of all city office lettings during the period. Knight Frank data shows a significant portion of these deals closed in April 2026.
The expansion establishes London as a primary European hub for the AI industry. Many firms are clustering in the Knowledge Quarter near King's Cross to compete for local talent.
Anthropic secured 158,000 square feet at One Triton Square. OpenAI took 88,500 square feet for its first permanent London office. These companies are deploying substantial capital to build a major operational presence outside the U.S.