[4] Holabird & Root, whose predecessor firm had designed the Otis Building on the site in 1912, served as associate architects.

Chicago Tribune architecture critic Paul Gapp lauded the reuse of the old facade as a brave gamble that paid off and "fits its financial canyon environs in fine fashion and friendly compatability [sic].

"[5] Gapp particularly hailed the work of the structural engineering firm Cohen-Barreto-Marchertas in preserving the Otis Building's perimeter caissons.

[5] Gapp's successor Blair Kamin, in contrast, named it among downtown Chicago's ugliest buildings, calling it a "garish intruder" that "disrupts the stately architectural canyon of LaSalle Street with its blue and Ghostbusters-green upper stories".

10 South LaSalle was built slightly earlier than its neighbor at 181 West Madison, and it was originally anticipated that both buildings might be part of a common design.