Two units of Marsh & McLennan will occupy approximately 134,000 sf in the 46-story office building, according to a statement released by JBC. Human resources consulting firm Mercer Inc. and risk and reinsurance specialist Guy Carpenter have also signed leases for space at the development. Representatives from JBC did not respond to requests to be interviewed. The estimated cost of the project is about $370 million, as previously reported by GlobeSt.com. Lease rates weren't revealed, but J. Frank Franzese with Cushman & Wakefield previously said rental depends on the floor, with rates in the mid- to high $30's per sf, net.

US Equities Realty president and COO Nancy Pacher, US Equities SVP Geoff Euston, Staubach Midwest LLC regional president Steve Stratton and Staubach managing principal Jock Howland represented Mercer and Guy Carpenter in the lease transactions. Marsh & McLennan currently leases space at 500 W. Monroe. The building at 155 N. Wacker Dr. will a two-story lobby clad in marble and a two-level subterranean parking garage.

The building, which is designed by Goettsch Partners, is currently 52% pre-leased, according to the release. Other tenants will include law firm Skadden Arps, Bridge Finance Group LLC and the American Hospital Association. The AMA has signed a lease for 115,000 sf for floors four through eight, as previously reported by GlobeSt.com. A bank syndicate led by Bank of America, LaSalle Bank and Helaba is providing the construction financing for the project.