In a way, there’s no longer any such thing as a big San Francisco law firm.

When Heller Ehrman Chairman Matthew Larrabee moves to New York City this month, none of the Am Law 100 firms rooted in San Francisco will be able to boast having both the firm chairman and the firm’s largest office here. Morrison & Foerster sent its chairman to New York a few years ago, Pillsbury Winthrop Shaw Pittman’s is in Los Angeles, and the leaders of Orrick, Herrington & Sutcliffe and Thelen Reid Brown Raysman & Steiner split time between S.F. and their bigger NYC offices.