Arkady and Boris Rotenberg are brothers who own Russia's top supplier of gas and electrical pipelines. Boris has been close friends Vladimir Putin since the 1960s when the two met while studying Judo.
Homes - Celebrity - Business
According to Forbes, Boris is the 100th, and Arkady the 99th wealthiest people in Russia.
The brothers built these two mansions, each a near perfect mirror image of the other, and each measuring approximately 75,000 sqft (almost 7,000 square meters).
Links: en.wikipedia.org, www.themoscowtimes.com, www.forbes.com, www.forbes.com