AI firms, including Anthropic and OpenAI, have leased more than 1 million square feet of office space in London since the start of 2025, representing about 7% of all lettings, with more than half of this activity occurring in April alone. This leasing surge is indicative of a broader trend where AI companies are filling prime London offices that were vacated during recent tech pullbacks, amid a supply-constrained market. Additionally, London is solidifying its position as a leading AI hub outside the US, attracting major expansions from both American and local AI firms.

OpenAI: OpenAI is an AI research and deployment company dedicated to advancing artificial general intelligence that benefits all of humanity through products for consumer, enterprise, and infrastructure applications. It continues scaling operations with emphasis on compute resources and new market deals. OpenAI has established its first permanent office in London, contributing to the wave of AI firms securing leases in the city.
Anthropic: Anthropic is an AI safety and research company building reliable, interpretable, and steerable AI systems as a public benefit corporation focused on responsible development for humanity’s long-term benefit. It develops advanced models with capabilities in agentic coding, persistent memory, and self-verification. Anthropic is actively expanding in London by leasing office space to grow its local presence amid surging AI demand.

`json
{
“Leasing Surge”: “AI companies are driving demand for office space in London, filling vacancies in a market limited by supply constraints.”,
“London AI Hub”: “London is establishing itself as a major hub for AI, with significant expansions from both local and international AI firms.”,
“Developer Outlook”: “Property developers are seeing benefits from increased demand by AI tenants, potentially boosting rental values at prime locations.”
}
`