Address: 18, 24 and 30 S. Michigan Ave. Year Built: 1899-1900 Architect: Louis H. Sullivan for 18 S.; Holabird & Roche for 24 and 30 S. Date Designated a Chicago Landmark: September 11, 1996

This group of three buildings takes its name from the northernmost structure which was designed by master architect Louis Sullivan for the Gage Brothers, a hat wholesaler. The facades, which resulted from Sullivan's collaboration with Holabird & Roche, demonstrate two different approaches to the Chicago School, a design movement that led to the creation of modern commercial architecture. The buildings by Holabird & Roche are straightforward, while the facade designed by Sullivan (18 S.) exemplifies his more expressive approach.

Holabird & Roche/Root Louis Sullivan
Early Skyscrapers Terra Cotta The Loop Boul Mich
1.	Post-addition View, photo by Barbara Crane
2.	Exterior, circa 1900
3.	Detail, photo by Barbara Crane
4.	Advertisement, Chicago Sunday Tribune, Feb.7, 1909