Patrizia has let close to 29,000 sq ft at 4ORTY, 40 Grosvenor Place, SW1, to medical group Cleveland Clinic.
The Ohio-based business agreed a 15-year lease, taking 10,548 sq ft on the ground floor and 18,293 sq ft on the first floor.
The 216,000 sq ft building is now more than 70% let, with a further 56,000 sq ft available.
Michael Pryer, senior director at Patrizia, said: “To have this long-term commitment to 4ORTY from a global business demonstrates the appeal of 40 Grosvenor Place, with its high-quality space and excellent location in the heart of Belgravia, driving demand from occupiers.
“Despite Brexit, London remains an attractive commercial location thanks to its enduring appeal as a global city and international centre of business.”
Knight Frank and Montagu Evans acted for Patrizia.
To send feedback, e-mail karl.tomusk@egi.co.uk or tweet @karltomusk or @estatesgazette