The White Tower, part of the MediaCityUK development in Salford Quaysm has been fully let.
Keep It Useable, a user experience agency has taken 724 sq ft on a five-year lease.
The tenant has secured a break option at the end of the third year as well as a eight- month rent free period.
Other tenants in White Tower include: Flix Facilities, Gov Today, Bright Future Software and Dock10.
The developer at White Tower is The Peel Group.