Floor-to-ceiling glass windows throughout keep the home bathed in bright light.
A private back garden is filled with greenery.
Previously owned by interior designer James Huniford, the house has warm touches like exposed wooden beams and arched entryways.
White sold his company MessageLabs to Symantec in 2008 for about $700 million. A year later, he snagged this land-marked property.
next slide will load in 15 secondsSkip AdSkip AdWith four bathrooms, two terraces, a servant's quarters, and that glass-topped roof space, it's 4,700 square feet of efficient living space.
An arty wrought-iron staircase winds up through the townhouse, too.