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NEW YORK CITY — Law firm Polsinelli PC has signed a 13,129-square-foot office lease expansion at 600 Third Avenue, a 575,254-square-foot building in Manhattan. The tenant, which also extended its lease by 10 years to run through 2036, now occupies 52,516 square feet across the entire 33rd, 40th, 41st and 42nd floors. David Berkey internally represented the landlord, L&L Holding Co., in the lease negotiations. Kevin McLennan, Ian Murphy and Silvio Petriello of CBRE represented Polsinelli PC.