Space House - One Kemble Street, London, UK

R. Seifert & Partners
Date Built
Completed 1966
1 Kemble Street
1 Kemble Street features a 15-storey circular tower known as "Space House". 

It sits on Kemble Street behind the 8-storey CAA House (Civil Aviation Authority) and linked to it by a bridge (see above). 

The original plan was for the building to be a luxury hotel with a circular tower that was twice as high but council objections resulted in a compromise and the building you see today.