Courtyard by Marriott Chicago Downtown/Magnificent Mile — Event Spaces, Floor Plans & Capacities
165 E Ontario St, Chicago, IL 60611
6 rooms · largest space: Ontario Ballroom, 2,618 sq ft243 m²
Courtyard by Marriott Chicago Downtown/Magnificent Mile gives Chicago event planners 6 rooms to work with. The largest space is Ontario Ballroom, 2,618 sq ft243 m² (divisible into 3 sections). It holds up to 290 guests. Review the layouts and seating capacities below, then test your setup in 3D — free.
Plan an event in Ontario Ballroom: open a free to-scale layout seating 120 at round tables in its 77 × 34 ft footprint at floors.live/start — no account needed.
Across its 6 rooms, Courtyard by Marriott Chicago Downtown/Magnificent Mile handles theater-style sessions for up to 290, seated banquets for 210 and standing receptions for 250. 3 smaller rooms suit breakouts and board meetings. Exact figures for every room and setup style are in the chart below.
Unverified listing — compiled from Courtyard by Marriott Chicago Downtown/Magnificent Mile’s published information. Venue staff can verify capacities and setups free: floors.live/venues/us/illinois/chicago/courtyard-by-marriott-chicago-downtown-magnificent-mile/?claim=1.
Floor plans
Detailed floor plans for Courtyard by Marriott Chicago Downtown/Magnificent Mile are published on the venue’s official site.
Work at this venue? to publish your official floor plans and 360° tours here — free.
Room capacities & dimensions
6 rooms, 9 configurations. Combined and divided set-ups are listed under their room.
| Space | Sq ft / m² | Ceiling | Banquet | Theater | Classroom | Reception | Conference | U-Shape | ||||||||||||||||||||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Chicago BoardroomPlan this room → | 308 sq ft29 m² | 10 ft3 m | — | — | — | — | 14 | — | ||||||||||||||||||||||||||||||||||||
| MichiganPlan this room → | 432 sq ft40 m² | 10 ft3 m | 30 | 48 | 25 | 40 | 20 | 15 | ||||||||||||||||||||||||||||||||||||
| Ontario APlan this room → | 986 sq ft92 m² | 10 ft3 m | 80 | 105 | 64 | 99 | 35 | 30 | ||||||||||||||||||||||||||||||||||||
3 configurations with Ontario A
| ||||||||||||||||||||||||||||||||||||||||||||
| Ontario BPlan this room → | 884 sq ft82 m² | 10 ft3 m | 70 | 90 | 56 | 89 | 30 | 25 | ||||||||||||||||||||||||||||||||||||
| Ontario CPlan this room → | 748 sq ft69 m² | 10 ft3 m | 60 | 83 | 50 | 79 | 25 | 20 | ||||||||||||||||||||||||||||||||||||
| St. ClairPlan this room → | 308 sq ft29 m² | 10 ft3 m | — | — | — | — | 10 | — | ||||||||||||||||||||||||||||||||||||
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 Courtyard by Marriott Chicago Downtown/Magnificent Mile?
Courtyard by Marriott Chicago Downtown/Magnificent Mile has 6 rooms. The largest space is Ontario Ballroom, 2,618 sq ft (77 × 34 ft). Every room's dimensions and seating capacity by setup are listed on this page. Courtyard by Marriott Chicago Downtown/Magnificent Mile's own floor plans are published on its website, linked from this page.
How many event rooms does Courtyard by Marriott Chicago Downtown/Magnificent Mile have?
Courtyard by Marriott Chicago Downtown/Magnificent Mile has 6 rooms. 9 configurations are listed on this page.
What is the largest space at Courtyard by Marriott Chicago Downtown/Magnificent Mile?
Ontario Ballroom, 2,618 sq ft (divisible into 3 sections): 77 × 34 ft, 210 banquet / 290 theater.
How many people can Courtyard by Marriott Chicago Downtown/Magnificent Mile seat for a banquet?
Up to 210 in Ontario Ballroom. The next largest room, Michigan, seats 30.
Can Ontario Ballroom be divided?
Yes. Ontario Ballroom divides into 3 sections: Ontario A, Ontario B, Ontario C.
What is the ceiling height at Courtyard by Marriott Chicago Downtown/Magnificent Mile?
The highest ceiling is 10 ft, in Chicago Boardroom.
More event venues near Chicago
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- Hyatt Centric Chicago Magnificent Mile · Chicago, IL · 0.1 mi straight-line
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Other event venues in Chicago, IL
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Event venues elsewhere in Illinois
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