Aloft by Marriott Boston Seaport District — Event Spaces & Capacities
401-403 D St, Boston, MA 02210
Aloft by Marriott Boston Seaport District in Boston offers 14 event spaces across 20,494 sq ft1,904 m² of function space. The largest room, Mann Ballroom, hosts up to 480 guests. Explore the floor plans and capacity charts below, or start arranging your own layout in the free planner.
Floor plans
Detailed floor plans for Aloft by Marriott Boston Seaport District are published on the venue’s official site.
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Room capacities & dimensions
| 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 |
| 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 BallroomPlan this room → | 4,582 sq ft426 m² | 12 ft3.7 m | 300 | 480 | 300 | 400 | 76 | 93 |
| 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 |
| Summer 2Plan this room → | 870 sq ft81 m² | 12 ft3.7 m | 50 | 80 | 48 | 75 | 24 | 27 |
| Summer BallroomPlan this room → | 1,798 sq ft167 m² | 12 ft3.7 m | 120 | 200 | 114 | 150 | 48 | 51 |
| 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.