Aloft by Marriott Boston Seaport District — Event Spaces, Floor Plans & 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.

Across its 14 spaces, 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.

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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

Room capacities and dimensions for Aloft by Marriott Boston Seaport District
SpaceSq ft / m²CeilingBanquetTheaterClassroomReceptionConferenceU-Shape
Mahoney Ex:ChangePlan this room →943 sq ft88 m²14 ft4.3 m609550803027
Mann 1Plan this room →1,508 sq ft140 m²12 ft3.7 m100150901304848
Mann 2Plan this room →1,508 sq ft140 m²12 ft3.7 m100150901304848
Mann 3Plan this room →1,624 sq ft151 m²12 ft3.7 m100150901304848
Mann BallroomPlan this room →4,582 sq ft426 m²12 ft3.7 m3004803004007693
Mann FoyerPlan this room →2,730 sq ft254 m²————150——
SmootPlan this room →784 sq ft73 m²12 ft3.7 m507054702427
Summer 1Plan this room →899 sq ft84 m²12 ft3.7 m508048752427
Summer 2Plan this room →870 sq ft81 m²12 ft3.7 m508048752427
Summer BallroomPlan this room →1,798 sq ft167 m²12 ft3.7 m1202001141504851
Summer FoyerPlan this room →1,980 sq ft184 m²————150——
Tactic 1Plan this room →475 sq ft44 m²14 ft4.3 m2040182016—
Tactic 2Plan this room →375 sq ft35 m²14 ft4.3 m204018201818
Tactic 3Plan this room →418 sq ft39 m²14 ft4.3 m204018351818

Figures from published venue data; blank cells mean the venue hasn’t published that number. Verify final counts with the venue.

Frequently asked questions

How many event spaces does Aloft by Marriott Boston Seaport District have?
Aloft by Marriott Boston Seaport District has 14 event spaces totaling 20,494 sq ft.
What is the largest event space at Aloft by Marriott Boston Seaport District?
The largest event space at Aloft by Marriott Boston Seaport District is Mann Ballroom, which holds up to 480 guests across 4,582 sq ft.
What is the banquet capacity of Mann Ballroom at Aloft by Marriott Boston Seaport District?
Mann Ballroom seats up to 300 guests in a banquet layout.
How many people fit in Mann Ballroom theater-style?
Mann Ballroom holds up to 480 guests in a theater setup.
What are the dimensions of Mann Ballroom?
Mann Ballroom measures 79 × 58 ft (4,582 sq ft) with 12 ft ceilings.

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