Orlando-based GrayRobinson has acquired the Boca Raton law firm of Siemon & Larsen to give it a third South Florida office and 11th statewide.

GrayRobinson’s new office in Mizner Park will open April 1. The office will have three lawyers to start — Charlie Siemon, Wendy Larsen and Michael Marshall — and hopes to grow, said GrayRobinson president Byrd "Biff" Marshall Jr. A fourth Siemon lawyer, Kara Cannizzaro, will not be joining Gray.