The Sefanovs bought the property for $1.25 million in Feb. 2007.
Roache is an actor on the wildly popular television series "Law and Order," where he plays Michael Cutter, the executive assistant of the district attorney. He joined the cast in 2008 after previously working on the series Kidnapped and in films like The Forgotten and Batman Begins.
He attended Bishop Luffa Church of England School in Chichester, West Sussex.
According to BlockShopper.com, there have been 134 condo sales in Chelsea during the past 12 months, with a median sales price of $760,000.
Address: 555 West 23rd Street, Unit: N11h
Buyer(s): Roache and Linus
Seller(s): Sefanov, Elena G, Sefanov and Gregory I
Sale date: Oct. 23, 2009