The firm's 1,000 employees are now occupying 11 floors in the landmark building at 787 Seventh Ave. Former occupant Ernst & Young LP vacated the space at Seventh Avenue and 51st Street in May to move into its own new quarters at 5 Times Square.

Sidley also is leasing around 3,000 square feet of conference space in Two World Financial Center. "It makes sense to maintain meeting space in lower Manhattan, given the amount of business we still conduct there, but it also has some genuine symbolic importance given our roots there," notes Tom Smith, vice chairman of Sidley's management committee.

Meanwhile, the lease on Sidley Austin's temporary space at 875 Third Ave. expired June 30. Insignia/ESG represented both Sidley Austin and building owner Equitable Life Assurance Society USA in negotiating the new 20-year lease.

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