The lawyers at Quinn Emanuel Urquhart Oliver & Hedges occasionally wear T-shirts and jeans to work, but they have a decidedly New York style.

The Los Angeles-based law firm is gearing up to move its New York office a fourth time since opening its doors nearly five years ago. That office — the only one of the firm’s five offices located outside of California — has grown to more than 50 lawyers, about 20 percent of the firm’s total lawyer head count.