Aloft by Marriott Boston Seaport District — Event Spaces, Floor Plans & Capacities
401-403 D St, Boston, MA 02210
12 rooms · largest space: Mann Ballroom, 4,582 sq ft426 m²
Aloft by Marriott Boston Seaport District in Boston offers 12 event rooms. The largest space is Mann Ballroom, 4,582 sq ft426 m² (divisible into 3 sections). It holds up to 480 guests. Explore the floor plans and capacity charts below, or start arranging your own layout in the free planner.
Plan an event in Mann Ballroom: open a free to-scale layout seating 240 at round tables in its 79 × 58 ft footprint at floors.live/start — no account needed.
Across its 12 rooms, Aloft by Marriott Boston Seaport District handles theater-style sessions for up to 480, seated banquets for 300 and standing receptions for 400. 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 Aloft by Marriott Boston Seaport District’s published information. Venue staff can verify capacities and setups free: floors.live/venues/us/massachusetts/boston/aloft-by-marriott-boston-seaport-district/?claim=1.
Floor plans
Detailed floor plans for Aloft by Marriott Boston Seaport District 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
12 rooms, 14 configurations. Combined and divided set-ups are listed under their room.
| Space | Sq ft / m² | Ceiling | Banquet | Theater | Classroom | Reception | Conference | U-Shape | ||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Mahoney Ex:ChangePlan this room → | 943 sq ft88 m² | 14 ft4.3 m | 60 | 95 | 50 | 80 | 30 | 27 | ||||||||||||||||||
| Mann 1Plan this room → | 1,508 sq ft140 m² | 12 ft3.7 m | 100 | 150 | 90 | 130 | 48 | 48 | ||||||||||||||||||
1 configuration with Mann 1
| ||||||||||||||||||||||||||
| Mann 2Plan this room → | 1,508 sq ft140 m² | 12 ft3.7 m | 100 | 150 | 90 | 130 | 48 | 48 | ||||||||||||||||||
| Mann 3Plan this room → | 1,624 sq ft151 m² | 12 ft3.7 m | 100 | 150 | 90 | 130 | 48 | 48 | ||||||||||||||||||
| Mann FoyerPlan this room → | 2,730 sq ft254 m² | — | — | — | — | 150 | — | — | ||||||||||||||||||
| SmootPlan this room → | 784 sq ft73 m² | 12 ft3.7 m | 50 | 70 | 54 | 70 | 24 | 27 | ||||||||||||||||||
| Summer 1Plan this room → | 899 sq ft84 m² | 12 ft3.7 m | 50 | 80 | 48 | 75 | 24 | 27 | ||||||||||||||||||
1 configuration with Summer 1
| ||||||||||||||||||||||||||
| Summer 2Plan this room → | 870 sq ft81 m² | 12 ft3.7 m | 50 | 80 | 48 | 75 | 24 | 27 | ||||||||||||||||||
| Summer FoyerPlan this room → | 1,980 sq ft184 m² | — | — | — | — | 150 | — | — | ||||||||||||||||||
| Tactic 1Plan this room → | 475 sq ft44 m² | 14 ft4.3 m | 20 | 40 | 18 | 20 | 16 | — | ||||||||||||||||||
| Tactic 2Plan this room → | 375 sq ft35 m² | 14 ft4.3 m | 20 | 40 | 18 | 20 | 18 | 18 | ||||||||||||||||||
| Tactic 3Plan this room → | 418 sq ft39 m² | 14 ft4.3 m | 20 | 40 | 18 | 35 | 18 | 18 | ||||||||||||||||||
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.
Frequently asked questions
What is the floor plan of Aloft by Marriott Boston Seaport District?
Aloft by Marriott Boston Seaport District has 12 rooms. The largest space is Mann Ballroom, 4,582 sq ft (79 × 58 ft). Every room's dimensions and seating capacity by setup are listed on this page. Aloft by Marriott Boston Seaport District's own floor plans are published on its website, linked from this page.
How many event rooms does Aloft by Marriott Boston Seaport District have?
Aloft by Marriott Boston Seaport District has 12 rooms. 14 configurations are listed on this page.
What is the largest space at Aloft by Marriott Boston Seaport District?
Mann Ballroom, 4,582 sq ft (divisible into 3 sections): 79 × 58 ft, 300 banquet / 480 theater.
How many people can Aloft by Marriott Boston Seaport District seat for a banquet?
Up to 300 in Mann Ballroom. The next largest room, Summer Ballroom, seats 120.
Can Mann Ballroom be divided?
Yes. Mann Ballroom divides into 3 sections: Mann 1, Mann 2, Mann 3.
What is the ceiling height at Aloft by Marriott Boston Seaport District?
The highest ceiling is 14 ft, in Mahoney Ex:Change.
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Event venues elsewhere in Massachusetts
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