CNM Estates has reportedly paid £53.5m for Tolworth Tower near Kingston-upon-Thames.
Tolworth Tower was designed by Richard Seifert; the building is 22 storeys high and is 300,000 sq ft in size.
The development consists of nearly 200,000 sq ft of office space, as well as car parking provision, a supermarket and a hotel.
Tolworth Tower is currently let to over thirty tenants. They include Close Brothers, Boots UK and Travelodge Hotels and the Government.
It is rumoured that CNM has plans to convert the office building to residential space.
BDO is acting as administrator on behalf of Stevenor Investments.
CNM Estates was advised by Colliers.