More than 500 homes in London sold for over $8.2 million last year, a 24 percent increase on a year earlier, even as value gains slowed.

Investors bought $8.7 billion of super-prime homes in the U.K. capital, Savills Plc said in a report Friday. More than 160 homes in the U.K. capital sold for more than $16.5 million in 2013, a quarter more than in 2012. The London-based broker defines super-prime homes as those that sell for more than 5 million pounds, or $8.2 million.