Marriott Chicago O'Hare Ballroom Capacities, Meeting Rooms & Floorplate Specs (34,800 Sq. Ft.)

Verified specs for 22 meeting rooms and the 9,633 sq. ft. main ballroom in Chicago, IL.

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Marriott Chicago O'Hare — Ballroom, Foyer & Breakout Capacity Matrix

34,800 sq. ft. total event space across 22 dedicated meeting rooms.

Functional Space Tier	Sq. Ft.	Ceiling	Theater	Banquet (10s)	Classroom	10×10 Booths	Rental Waiver Rule
Grand Pillarless Ballroom (Main General Session) Keynote, General Session & Plated Gala Anchor	9,633 sq. ft.	22'–26' Clear	1,014	714	602	48 booths	$0 Rental w/ $28,000 F&B Min
Junior Ballroom & Divisional Plated Dining Hall Luncheons, Partner Summits & VIP Receptions	8,500 sq. ft.	18'–22' Clear	895	630	531	43 booths	$0 Rental w/ $14,000 F&B Min
Pre-Function Registration & Sponsor Showcase Concourse Badge Pickup, Tabletop Sponsors & Networking Breaks	6,264 sq. ft.	16'–24' Atrium	522	418	313	31 booths	Included w/ Grand Ballroom License
Executive Breakout & Boardroom Wing (22 Rooms Total) 1-on-1 Enterprise Deal Rooms, Track Breakouts & Speaker Ready	2,400 sq. ft.	12'–16' Clear	240	171	141	12 booths	$0 w/ 50+ Peak Night Room Block

Marriott Chicago O'Hare — 8-Row Master Property & Group Contract Summary

Guest Room Inventory & Peak Group Allocation

470 Total Keys · Up to 197 Peak Group Block Rooms

Standard 1-per-40 cumulative complimentary room credit; request 1-per-35 comp ratio + 3 VIP suite upgrades at group rates during RFP.

Total Event Space & Breakout Room Ratio

34,800 Sq. Ft. Total · 22 Dedicated Meeting & Breakout Rooms

Optimal for 282–1,014 attendee conferences requiring simultaneous keynote and breakout tracks.

Largest Pillarless Ballroom Capacity

9,633 Sq. Ft. · 1,014 Theater · 714 Plated Banquet

Divisible soundproof airwalls; supports up to 48 standard 10×10 tabletop/exhibit booths (~200 gross sq. ft./booth) with 24-hour hold option.

Primary Convention Campus Connectivity

McCormick Place Convention Center (8–12 min official show shuttle / rideshare)

Primary headquarter and exhibitor room-block anchor serving McCormick Place Convention Center.

Airport Transfer & Motorcoach Staging

ORD (Chicago O’Hare International Airport) · 16.5 mi (24 mins off-peak / 45–62 mins peak)

Dedicated group porte-cochere / motorcoach staging lane available with 14-day advance manifest submission to hotel convention services.

Nightly Room Rate, Resort Fee & Tax Structure

$269/nt Group Block vs. $459/nt Peak Rack · 17.4% Chicago / MPEA Hotel Operator Tax

Mandatory $25/nt resort/destination fee is 100% waived when contracted through the Conventions.com Housing Desk (saves $252/room/night all-in).

Banquet F&B '++' Multiplier & Catering Minimums

$28,000 Ballroom Waiver Min · 25% Service + 11.75% Tax (+39.7% Effective)

Contract F&B minimums on a cumulative multi-day program basis (breakfasts + breaks + reception combined) rather than per-room/per-day minimums.

Attrition, Cutoff & Cancellation Protection

80% Cumulative Pickup Allowance · 30-Day Cutoff · 100% Rebooking Resell Credit

Always insist on cumulative (not night-by-night) attrition calculation and a 'Resell Mitigation Clause' crediting any rooms resold by the hotel after cutoff.