Arnstein & Lehr LLP has elected a new management team and, for the first time in its 121-year history, its chairman will be based outside of Chicago. Jeffrey B. Shapiro, managing partner of the firm’s Florida offices, will take over as chairman Oct. 1. Shapiro was elected in a unanimous vote by the firm’s equity partners.Michael L. Gesas was elected managing partner of the Chicago office, and Barry A. Chatz was named partner-in-charge of firm-wide strategic planning and acquisitions. “I look …