Helical has leased 2,564 sq ft at 55 Bartholomew Close, EC1, to interactive screen provider Clevertouch.
The company has agreed a five-year lease at a headline rent of £75 per sq ft for the entire 2,564 sq ft ground floor of the office building.
Clevertouch will join hedge fund ShadowFall at the property, which leased the fifth floor earlier this year. Around 7,372 sq ft remains available, across floorplates of 789 to 1,748 sq ft.