New York’s Kelley Drye & Warren voted Tuesday evening to acquire Washington-based Collier Shannon Scott, a combination that will create a 350-lawyer firm with expected gross revenues of more than $220 million.

The move will more than double Kelley Drye’s Washington presence to about 125 lawyers and bring the mainly corporate and litigation firm a mix of regulatory practices, including Collier Shannon’s well-regarded advertising, international trade, and antitrust groups.