CHESTERTON - London
A man is walking past 8 Chesterfield Hill, (Mercantile Group HQ) in central London, United Kingdom.
CREDIT: Alex Masi for The Wall Street Journal
The name of London real-estate agency Chesterton Humberts exudes English affluence. But in early 2011, as Libya was engulfed in revolution, a substantial stake in the firm was quietly acquired by the wealthy family of a longtime lieutenant to Moammar Gadhafi, according to a person with direct knowledge of the investment.