Marble Arch House is now 80% let following two recent lettings.
GTECH, the gaming technology company has occupied 11,500 sq ft on a ten-year lease.
In addition, BXR Partners has taken 11,200 sq ft off office space on the fourth floor.
The landlord, British Land has redeveloped Marble Arch House since purchasing the property back in 2011.
Other tenants in the building include: Access Industries, Fulcrum Asset Management and NERA Consulting.
There is now only 11,400 sq ft available to let.
GTECH was advised by Simon Howell.
BXR Partners was represented by Monmouth Dean.
British Land was represented by Cushman & Wakefield and CBRE.