[1] The interior renovation and redesign of the building was by architect César Pelli; Pelli also designed the Petronas Twin Towers in Kuala Lumpur.

[2] As of July 2008, the structure stands as the 32nd-tallest building in the city, tied in rank with 1310 G Street, 1430 K Street, 1875 K Street, the Westin Washington, D.C. City Center, the Executive Tower, 1701 Pennsylvania Avenue the Capital Hilton and The Westin Washington, D.C. City Center.

[3] The modern Investment Building rises two floors higher than its predecessor.

[3] The building is principally occupied by Sidley Austin, the sixth largest law firm in the United States; and by the Washington office of UBS.

[citation needed] Its ground floor houses The Catholic Information Center, a Catholic bookstore, and a Cosi's coffee house.