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NEW YORK CITY — Private equity firm Corsair Capital has signed a 23,919-square-foot office lease at 550 Madison Avenue in Midtown Manhattan. Since opening in 1984, the 41-story building has housed the operations of two tenants: AT&T and Sony. Silvio Petriello and Chris Corrinet of CBRE represented the tenant in the lease negotiations. Mary Anne Tighe, Howard Fiddle and Scott Gottlieb, also with CBRE, represented the landlord, The Olayan Group, which acquired the asset in 2016 and implemented a value-add program.