The St. Regis Chicago — Event Spaces, Floor Plans & Capacities

401 E Wacker Dr, Chicago, IL 60601

The St. Regis Chicago gives Chicago event planners 12 spaces to work with across 19,944 sq ft1,853 m² of function space. The largest room, Astor Ballroom, hosts up to 420 guests. Review the layouts and seating capacities below, then test your setup in 3D — free.

Across its 12 spaces, The St. Regis Chicago handles theater-style sessions for up to 420, seated banquets for 240 and standing receptions for 350. 5 smaller rooms suit breakouts and board meetings. Exact figures for every room and setup style are in the chart below.

Plan your event in this space — free

Floor plans

Detailed floor plans for The St. Regis Chicago are published on the venue’s official site.

View official floor plans at Marriott ↗Plan your event in this space — free

Work at The St. Regis Chicago? to publish your official floor plans and 360° tours here — free.

Room capacities & dimensions

Room capacities and dimensions for The St. Regis Chicago
SpaceSq ft / m²CeilingBanquetTheaterClassroomReceptionConferenceU-Shape
Astor BallroomPlan this room →4,721 sq ft439 m²30 ft9.1 m2404202433506680
Astor Ballroom IPlan this room →2,341 sq ft217 m²30 ft9.1 m1101761081754257
Astor Ballroom IIPlan this room →2,379 sq ft221 m²30 ft9.1 m1101761081754257
Astor Ballroom Pre-FunctionPlan this room →1,370 sq ft127 m²30 ft9.1 m40——180——
CarnegiePlan this room →713 sq ft66 m²11 ft3.4 m404836481827
Drawing RoomPlan this room →475 sq ft44 m²10 ft3 m35——35——
John Jacob Astor BoardroomPlan this room →546 sq ft51 m²11 ft3.4 m————10—
LibraryPlan this room →432 sq ft40 m²10.6 ft3.2 m30——33——
MorganPlan this room →783 sq ft73 m²11 ft3.4 m405036501827
RockefellerPlan this room →1,157 sq ft107 m²11 ft3.4 m507236703033
St. Regis TerracePlan this room →2,706 sq ft251 m²—80——160——
Third Floor Pre FunctionPlan this room →2,321 sq ft216 m²11 ft3.4 m———150——

Figures from published venue data; blank cells mean the venue hasn’t published that number. Verify final counts with the venue.

Frequently asked questions

How many event spaces does The St. Regis Chicago have?
The St. Regis Chicago has 12 event spaces totaling 19,944 sq ft.
What is the largest event space at The St. Regis Chicago?
The largest event space at The St. Regis Chicago is Astor Ballroom, which holds up to 420 guests across 4,721 sq ft.
What is the banquet capacity of Astor Ballroom at The St. Regis Chicago?
Astor Ballroom seats up to 240 guests in a banquet layout.
How many people fit in Astor Ballroom theater-style?
Astor Ballroom holds up to 420 guests in a theater setup.
What are the dimensions of Astor Ballroom?
Astor Ballroom measures 57.6 × 76.1 ft (4,721 sq ft) with 30 ft ceilings.

More event venues near Chicago

Other event venues in Chicago, IL

Event venues elsewhere in Illinois

Venues with similar capacity (~420 guests)