EVP & Chief Investment Officer Zimmerman Gregory E covered exercise/tax liability with 14,290 units of Common Shares of Beneficial Interest, gifted 17,043 units of Common Shares of Beneficial Interest, received a gift of 17,043 units of Common Shares of Beneficial Interest and sold $375,538 worth of Common Shares of Beneficial Interest (7,500 units at $50.07), decreasing direct ownership by 46% to 36,517 units (SEC Form 4)