However, that rate is above the curve for class-A office space Downtown, according to U.S. Equities Realty, which sets the upper end of the range at $28 per sf. Jason Schulz of Levy Organization Real Estate Services, who represented the law firm along with Holly Duran and Richard Schulz, would only say, "the landlord was very competitive."

The owners of the 1.54-million-sf building had to be, as the choices included at least three strong candidates in 111 S. Wacker Dr., a building being developed by Hines Interests at 200 N. Riverside Plaza and 130 N. Franklin St., Schulz tells GlobeSt.com.

"It was extremely competitive for the relocation alternatives," he explains. "The landlord offered them a transaction that was comparable and alleviated the pain of moving."

The move would not have been outside the submarket. "The majority of the partners and the attorneys come in and out of the Ogilvie Transportation Center," Schulz tells GlobeSt.com.

Joseph Gordon, regional general manager of Tower Realty Management Corp., represented building ownership, which acquired the property in 1995 for $345 million. The lease keeps occupancy at AT&T Corporate Center/USG Building at 99%. Other tenants include CS First Boston, AT&T Corp., William Blair & Co. and JPMorgan Chase Bank.