There goes another one. The law firm Finnegan, Henderson, Farabow, Garrett & Dunner is the latest business to join the exodus from East Cambridge to Boston’s growing Innovation District.

The firm that specializes in intellectual property law is taking up residence in Seaport Place, a 2.26 million-square-foot development at the center of the South Boston Waterfront’s transformation into a hub for high-tech companies and related services.