The Westin San Diego Gaslamp Quarter, at 910 Broadway Circle downtown, lists 21 event venues stacked across four floors, from the 9,064 sq ft California Ballroom and the fourth-floor San Diego Ballroom to the outdoor Garden Terrace. Above the Line provides audio, video, lighting and LED for events across the hotel.
The Westin stacks two ballrooms and its breakout rooms on four floors, so a general session, breakouts and a terrace reception can sit close together. We plan each one from the hotel's capacity chart and floor plans, and keep audio, video and show files moving between floors.
Room names, dimensions and capacities come from the capacity chart on the hotel's events page at marriott.com. Photos and floor plans are the hotel's own. Production notes describe a typical Above the Line setup for each space.
The second-floor ballroom, with a bright foyer above the lobby's floor-to-ceiling windows.
Reception 950 · Theater 900 · Banquet 690 · Schoolroom 480 · U-shape 246
For a 900-seat general session, we run twin side screens or a center LED wall within the 16-foot ceiling, with delay speakers for the back third of the room.
Three sections that can be used singly or as AB and BC pairs.
Each section: theater 300 · reception 315 · banquet 230 · schoolroom 168. AB or BC: theater 600 · reception 630 · banquet 460
When A runs as a breakout and BC holds lunch, we zone audio by section and keep a separate screen and lectern in each.
The fourth-floor ballroom, which the hotel describes as having modern accents and extensive lighting and rigging capabilities, next to the Garden Terrace.
Theater 650 · Reception 600 · Banquet 430 · Schoolroom 300 · U-shape 164
With an 18-foot ceiling and rigging points, we can fly the PA and a lighting truss here and leave the floor clear for rounds and a dance floor.
One of the larger outdoor event spaces in the Gaslamp Quarter, beside the San Diego Ballroom, with greenery, Tivoli lights and projection capabilities.
Reception 600 · Banquet 350
For an indoor-outdoor event, we zone audio between the ballroom and the terrace and tie terrace projection to the same show computer.
The terrace also works on its own for cocktail receptions with downtown views.
After dark, we wash the pergolas in color and add gobo projection, keeping speakers aimed in toward guests.
A third-floor room with natural light, which divides into two equal halves.
Reception 125 · Theater 120 · Banquet 80 · Schoolroom 60 · Conference 48 · U-shape 40
With an 8-foot ceiling and window light, we use a bright LED monitor or short-throw projector instead of a high screen.
Three breakout rooms. The Plaza divides into A, B and C, and the Sierra into A and B.
Plaza theater 200 · Santa Fe theater 144 · Sierra theater 110
We set each breakout with a projector and screen, a lectern mic and a recording feed when sessions will be shared afterward.
Lobby-level meeting rooms near the front desk, shown on the lobby-level plan.
La Jolla theater 112 · Del Mar theater 112 · Solana theater 30
Because these rooms sit off the lobby, we keep the audio contained and use signage displays at each door for wayfinding.
A third-floor suite of four small rooms for interviews, offices and small meetings.
Cardiff A, B and D theater 15–16 · Cardiff C theater 12
As production offices or interview rooms, each Cardiff room gets one monitor and a simple camera and mic kit.
Two boardrooms. The hotel notes natural light in the Pacifica Boardroom.
Conference 20 each · Imperial theater 60
For a hybrid board meeting, we pair a wall display with a conference camera and boundary mics on the table.
The pool deck on the third level, used for receptions.
Reception 60
By the pool, we use weather-rated speakers and battery uplights, and keep all cabling well back from the water.
A lobby-level private dining room next to the Bronze Bird restaurant, and an outdoor terrace along the third-floor Harbor rooms.
Private Dining Room: reception 55 · theater 50 · banquet 40. Harbor Terrace: reception 150 · banquet 80
For a private dinner, a single display for a welcome video and one wireless mic for remarks is usually all it needs.
Capacities as published in the hotel's capacity chart.
| Room | Dimensions (L × W × H) | Sq ft | Theater | Schoolroom | Conference | U-shape | Reception | Banquet |
|---|---|---|---|---|---|---|---|---|
| Second floor | ||||||||
| California Ballroom | 103' × 88' × 16' | 9,064 | 900 | 480 | 246 | 950 | 690 | |
| California Ballroom A | 35' × 88' × 16' | 3,080 | 300 | 168 | 84 | 82 | 315 | 230 |
| California Ballroom B | 33' × 88' × 16' | 2,904 | 300 | 168 | 84 | 82 | 315 | 230 |
| California Ballroom C | 35' × 88' × 16' | 3,080 | 300 | 168 | 84 | 82 | 315 | 230 |
| California Ballroom AB | 68' × 88' × 16' | 5,984 | 600 | 336 | 168 | 164 | 630 | 460 |
| California Ballroom BC | 68' × 88' × 16' | 5,984 | 600 | 336 | 168 | 164 | 630 | 460 |
| California Foyer | 12' high | 1,500 | ||||||
| Plaza | 29' × 60' × 10' | 1,740 | 200 | 100 | 58 | 52 | 185 | 130 |
| Plaza A | 29' × 20' × 10' | 580 | 66 | 32 | 20 | 24 | 60 | 50 |
| Plaza B | 29' × 20' × 10' | 580 | 66 | 32 | 20 | 24 | 60 | 40 |
| Plaza C | 29' × 20' × 10' | 580 | 66 | 32 | 20 | 24 | 60 | 40 |
| Plaza AB | 29' × 40' × 10' | 1,160 | 132 | 66 | 38 | 40 | 120 | 90 |
| Plaza BC | 29' × 40' × 10' | 1,160 | 132 | 66 | 38 | 40 | 120 | 80 |
| Santa Fe | 24' × 47' × 10' | 1,128 | 144 | 72 | 40 | 46 | 115 | 80 |
| Santa Fe Foyer | 21' × 62' × 12' | 1,302 | ||||||
| Sierra | 50' × 23' × 10' | 1,150 | 110 | 48 | 120 | 80 | ||
| Sierra A | 25' × 23' × 10' | 575 | 60 | 27 | 20 | 18 | 60 | 40 |
| Sierra B | 25' × 23' × 10' | 575 | 60 | 27 | 20 | 18 | 60 | 40 |
| Imperial Boardroom | 21' × 30' × 10' | 630 | 60 | 28 | 20 | 20 | 70 | 40 |
| Pacifica Boardroom | 21' × 30' × 10' | 630 | 20 | |||||
| Lobby level | ||||||||
| La Jolla | 40' × 31' × 11' | 1,240 | 112 | 72 | 28 | 35 | 120 | 80 |
| Del Mar | 37' × 31' × 10' | 1,147 | 112 | 72 | 26 | 31 | 115 | 80 |
| Solana | 24' × 14' × 11' | 336 | 30 | 16 | 14 | 12 | 30 | 20 |
| Private Dining Room | 13' × 40' × 14' | 520 | 50 | 42 | 23 | 22 | 55 | 40 |
| Third level | ||||||||
| Harbor | 25' × 48' × 8' | 1,200 | 120 | 60 | 48 | 40 | 125 | 80 |
| Harbor A | 25' × 24' × 8' | 600 | 60 | 30 | 20 | 22 | 60 | 40 |
| Harbor B | 25' × 24' × 8' | 600 | 60 | 30 | 20 | 22 | 60 | 40 |
| Harbor Foyer | 16' × 50' × 10' | 800 | ||||||
| Harbor Terrace | 125' × 25' | 2,043 | 150 | 80 | ||||
| Coronado | 25' × 34' × 8' | 850 | 80 | 40 | 28 | 30 | 85 | 50 |
| Coronado Lounge | 26' × 22' × 10' | 572 | ||||||
| Balboa | 25' × 28' × 8' | 700 | 60 | 30 | 20 | 22 | 70 | 48 |
| Balboa Passage | 26' × 16' × 8' | 416 | 3 | 30 | ||||
| Cardiff | 28' × 25' × 8' | 700 | ||||||
| Cardiff A | 14' × 12' × 8' | 168 | 15 | 6 | 8 | 9 | 10 | |
| Cardiff B | 13' × 12' × 8' | 156 | 15 | 6 | 8 | 9 | 10 | |
| Cardiff C | 14' × 9' × 8' | 126 | 12 | 6 | ||||
| Cardiff D | 14' × 16' × 8' | 224 | 16 | 6 | 8 | 9 | 10 | |
| Pool | 83' × 19' × 19' | 1,577 | 60 | |||||
| Fourth floor | ||||||||
| San Diego Ballroom | 66' × 90' × 18' | 5,940 | 650 | 300 | 164 | 600 | 430 | |
| San Diego Foyer | 27.5' × 12' × 10' | 330 | 3 | |||||
| Garden Terrace | 54' × 107' × 9' | 5,778 | 600 | 350 | ||||
Sources: capacity chart, floor plans and photos on the hotel's events page. Retrieved October 24, 2026. A blank cell means the figure is not published.
The chart lists conference seating for 3 in the Balboa Passage and San Diego Foyer. Those figures are shown as published.
Not an official Westin or Marriott website. Confirm every capacity with the hotel before contracting.
Floor plans published on the hotel's events page. The hotel published plans for the lobby and third levels.
Wireless and podium mics with a PA tuned for the California Ballroom's 16-foot ceiling.
Projection and bright LED displays sized to each room and its daylight.
Warm lighting and uplighting for dinners, receptions and award nights.
LED walls for general sessions, launches and award moments.
Cameras, switching and streaming for hybrid meetings and boardrooms.
We draw layouts from The Westin San Diego Gaslamp Quarter's own room specs and a site walk.
Weather-rated audio and lighting for terraces and outdoor spaces.
Itemized budgets for The Westin San Diego Gaslamp Quarter, with every line explained.
Our technicians work alongside the hotel's event team from load-in to strike.
Gear ships from our own Southern California warehouses.
We maintain our inventory from VUE, Shure, Barco, Avid, Yamaha and Sony.
We work in downtown San Diego every week, from the Gaslamp Quarter to the waterfront.
We build walk-in loops, sponsor slides and award graphics sized to your screens.
Our itemized budgets match what is actually in the room.
We keep you updated clearly and consistently from proposal to strike.
Our proposals are drawn from the hotel's own room specs.
In 16 years and 2,113 events, including 85 concerts, our team has handled everything from early design to show day.
Learn More →We support conventions, corporate meetings and celebrations across the hotel, from the California Ballroom to the Garden Terrace.
Learn More →In-house AV: Encore. Outside AV vendors like Above the Line can work alongside or instead, subject to hotel policy.
Above the Line, your AV partner at The Westin San Diego Gaslamp Quarter. Succeed Today →
Send your RFP or room plan for The Westin San Diego Gaslamp Quarter, and we'll return an itemized quote.
