California-based The Trade Desk has become the first occupier to sign up at AshbyCapital and Helical’s new Farringdon office development One Bartholomew taking a 55,000 sq ft pre-let.

The letting sees the California-based company take the top three floors, including the tenth-floor terrace, of the 12-storey, 215,000 sq ft office building within the Barts Square development in London’s Farringdon.

Developed by Helical alongside investor AshbyCapital, the building is due to complete later this year offering grade-A office accommodation.

Peter Ferrari, chief executive at AshbyCapital, said:

“This significant pre-letting to a global media tech company several months before completion is testament to the wide ranging demand for high-quality office space close to the new Elizabeth Line station at Farringdon. With a wide and growing range of amenities excellent transport links – and a creative vibe, this is London’s new neighbourhood in which we are creating a first-rate new office building.”

Gerald Kaye, chief executive of Helical, said:

“It is exciting to welcome the first office occupier to our Barts Square development as this new mixed-use destination to take shape. Combining homes, retail and office space with landscaped public areas, this is set to be a fantastic new place to live, work and spend time at the heart of one of London’s most vibrant locations.”

Agents for One Bartholomew are CBRE, Savills and Ingleby Trice. DeVono Cresa represented The Trade Desk.