Raduga building, Office building in Saint Petersburg, Russia

The Raduga building is a high-rise with 24 floors and 85 meters tall, shaping the Kantemirovskaya street in Saint Petersburg. Inside are office spaces and a data center called K12.

The 24-storey tower was built over many years for the LNPО "Krasnaya Zarya" association, to a design by architects S. V. Savin and S. M. Zeltsman under the direction of B. E. Sandler, and was finished in 1991. It was originally planned to rise about 100 metres. After the break-up of the USSR the owner began renting out floors, and the building was taken over by AOOT "NPP Raduga", a former division of Krasnaya Zarya that became an independent organisation.

The building shows late Soviet design with clean geometric forms and functional layouts built for office work. Its architectural style reflects what was common in Leningrad during this period.

The Raduga building stands at 12 Kantemirovskaya Street on the Vyborg Side, and the nearest metro station is Lesnaya. The 24-storey tower is a working office building with a commercial data centre linked to the SPB-IX site, so access is for tenants and their business visitors rather than tourists.

The facade's bronze-chocolate tint comes from antimony oxides applied to the glass at high temperature; the panes themselves, called "teraflex", were made in East Germany. The original design foresaw a height of about 100 metres, and the built tower reaches 24 floors with a total area of 12,500 m². A commercial data centre tied to the SPB-IX exchange point now operates inside.