The St. Regis Chicago — Event Spaces, Floor Plans & Capacities
401 E Wacker Dr, Chicago, IL 60601
11 rooms · largest space: Astor Ballroom, 4,721 sq ft439 m²
The St. Regis Chicago gives Chicago event planners 11 rooms to work with. The largest space is Astor Ballroom, 4,721 sq ft439 m² (divisible into 2 sections). It holds up to 420 guests. Review the layouts and seating capacities below, then test your setup in 3D — free.
Plan an event in Astor Ballroom: open a free to-scale layout seating 240 at round tables in its 58 × 76 ft footprint at floors.live/start — no account needed.
Across its 11 rooms, 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.
Unverified listing — compiled from The St. Regis Chicago’s published information. Venue staff can verify capacities and setups free: floors.live/venues/us/illinois/chicago/the-st-regis-chicago/?claim=1.
Floor plans
Detailed floor plans for The St. Regis Chicago are published on the venue’s official site.
Work at The St. Regis Chicago? to publish your official floor plans and 360° tours here — free.
Room capacities & dimensions
11 rooms, 12 configurations. Combined and divided set-ups are listed under their room.
| Space | Sq ft / m² | Ceiling | Banquet | Theater | Classroom | Reception | Conference | U-Shape | ||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Astor Ballroom IPlan this room → | 2,341 sq ft217 m² | 30 ft9.1 m | 110 | 176 | 108 | 175 | 42 | 57 | ||||||||||||||||||
1 configuration with Astor Ballroom I
| ||||||||||||||||||||||||||
| Astor Ballroom IIPlan this room → | 2,379 sq ft221 m² | 30 ft9.1 m | 110 | 176 | 108 | 175 | 42 | 57 | ||||||||||||||||||
| Astor Ballroom Pre-FunctionPlan this room → | 1,370 sq ft127 m² | 30 ft9.1 m | 40 | — | — | 180 | — | — | ||||||||||||||||||
| CarnegiePlan this room → | 713 sq ft66 m² | 11 ft3.4 m | 40 | 48 | 36 | 48 | 18 | 27 | ||||||||||||||||||
| Drawing RoomPlan this room → | 475 sq ft44 m² | 10 ft3 m | 35 | — | — | 35 | — | — | ||||||||||||||||||
| John Jacob Astor BoardroomPlan this room → | 546 sq ft51 m² | 11 ft3.4 m | — | — | — | — | 10 | — | ||||||||||||||||||
| LibraryPlan this room → | 432 sq ft40 m² | 10.6 ft3.2 m | 30 | — | — | 33 | — | — | ||||||||||||||||||
| MorganPlan this room → | 783 sq ft73 m² | 11 ft3.4 m | 40 | 50 | 36 | 50 | 18 | 27 | ||||||||||||||||||
| RockefellerPlan this room → | 1,157 sq ft107 m² | 11 ft3.4 m | 50 | 72 | 36 | 70 | 30 | 33 | ||||||||||||||||||
| St. Regis TerracePlan this room → | 2,706 sq ft251 m² | — | 80 | — | — | 160 | — | — | ||||||||||||||||||
| Third Floor Pre FunctionPlan this room → | 2,321 sq ft216 m² | 11 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.
Sizing another room? Try the event room capacity calculator or the floor plan scale converter, or compare the largest event spaces in Chicago.
Frequently asked questions
What is the floor plan of The St. Regis Chicago?
The St. Regis Chicago has 11 rooms. The largest space is Astor Ballroom, 4,721 sq ft (57.6 × 76.1 ft). Every room's dimensions and seating capacity by setup are listed on this page. The St. Regis Chicago's own floor plans are published on its website, linked from this page.
How many event rooms does The St. Regis Chicago have?
The St. Regis Chicago has 11 rooms. 12 configurations are listed on this page.
What is the largest space at The St. Regis Chicago?
Astor Ballroom, 4,721 sq ft (divisible into 2 sections): 57.6 × 76.1 ft, 240 banquet / 420 theater.
How many people can The St. Regis Chicago seat for a banquet?
Up to 240 in Astor Ballroom. The next largest room, St. Regis Terrace, seats 80.
Can Astor Ballroom be divided?
Yes. Astor Ballroom divides into 2 sections: Astor Ballroom I, Astor Ballroom II.
What is the ceiling height at The St. Regis Chicago?
The highest ceiling is 30 ft, in Astor Ballroom I.
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