How do you add a convention center the size of a small stadium to a city without bulldozing a neighborhood? Seattle just answered that question. LMN Architects, the Seattle convention center architect behind the Summit Building. Stacked the whole program vertically instead of spreading it across a parking lot. And the result gets called the first high-rise convention center in North America. That one decision drives almost everything else about the building the 200 foot atrium. The way crowds move between floors, even how it sits next to three different neighborhoods at once.
Below, I’ll walk through who actually designed it, why going vertical mattered, what’s inside. And how it stacks up against older, sprawling convention halls elsewhere in the country. If you’re researching this for a design portfolio or just trying to figure out. If it’s the right venue for your next event, this should cover it.
Who Designed the Seattle Convention Center Summit Building?
LMN Architects, a Seattle-based firm. Served as design architect for the Summit Building the newer of the two structures that now make up the Seattle Convention Center. LMN has a long history with civic and cultural work around the Pacific Northwest. But Summit is arguably the highest-profile commission the firm has taken on. Construction finished in 2023, and the building opened as a companion to the original Arch building. Sitting about a block and a half away on the other side of downtown.
What’s unusual here isn’t the price tag, though $2 billion is nothing to shrug at. It’s the site. LMN had to work inside one of the most cramped. Hemmed-in blocks of Seattle’s urban core surrounded by streets, existing buildings, and Interstate 5 running practically underneath it. There was nowhere to spread out. So the team didn’t. That constraint, more than any aesthetic preference, is why Summit goes up instead of out, unlike the low. Sprawling convention halls you’ll find in most other American cities.
Why Is LMN Architects Considered the Lead Firm on This Project?
LMN held the design architect role for the entire Summit Building program. Start to finish that’s why it’s credited as lead. Projects like this pull in dozens of consultants: structural engineers, landscape architects, signage fabricators, lighting designers. Usually one firm owns the overall vision, and for Summit, that was LMN. Magnusson Klemencic Associates handled structural engineering. Which mattered a lot given how unusual the building’s vertical loads were compared to a typical single-story hall. General contracting was split between Clark Construction Group and Lease Crutcher Lewis, a joint-venture setup that’s fairly standard on projects this large.
What Makes the Summit Building’s Design Different From Other Convention Centers?
It goes up instead of out. Most American convention centers are single story or two story boxes ringed by parking, because land used to be cheap and flat, and nobody had a reason to build any other way. Seattle didn’t have that option. Summit occupies roughly four city blocks and climbs through multiple stacked levels of event space, all tied together by a central atrium that runs the full height of the building.
That atrium isn’t just there to look impressive. It’s the circulation spine for the whole venue escalators, open stairs, and a glass-enclosed staircase nicknamed “The Hillclimb” move large crowds between floors fast. Anyone who’s stood in a slow elevator line at an older convention center knows why this matters. I’ve walked through a few comparable vertical civic buildings over the years, and a wide, visible staircase changes how long a wait feels, even when the actual travel time barely differs from a slow elevator bank.
How Big Is the Seattle Convention Center Summit Building?
Summit adds roughly 1.5 million square feet to the convention center campus, based on LMN’s own project materials. Most of that is meeting and event space spread across several floors, with the rest going to circulation, back of house functions, and public gathering areas. For context, that’s a bigger single addition than most U.S. convention centers see in one phase plenty of expansions land closer to 200,000 to 400,000 square feet at a time. Anyone booking the venue should double-check current room counts and capacity figures directly through the Seattle Convention Center’s own listings, since spaces do get reconfigured and updated over time.
Does the Design Include Local Art and Landscape Features?
Yes. Gustafson Guthrie Nichol handled landscape design, and Graham Baba Architects contributed to adjacent market-hall space within the broader campus, with room made throughout for Pacific Northwest and Indigenous art. The goal, according to public statements from the design team, was to make something this large still feel rooted in Seattle rather than defaulting to a glass box that could sit in any downtown in the country.
How Does the Summit Building Fit Into Seattle’s Urban Core?
Here’s where the site strategy gets genuinely interesting. Summit sits right at the intersection of Capitol Hill, First Hill, and downtown three of the densest neighborhoods in the city. Instead of treating that intersection as a wall to route around, the design uses it as connective tissue. Pedestrians moving between those neighborhoods pass along and through the building’s ground-level public space, whether they’re headed to a convention or not.
That’s a bigger deal than it sounds. Convention centers have a reputation for killing street life, especially when loading docks and blank concrete walls face the sidewalk. Summit flips that retail, lobby space, and visible activity get pushed toward the street edges instead of tucked away. It’s a pretty clear break from the “fortress” model that a lot of 1980s and ’90s convention architecture leaned on, arguably including parts of the original Arch building next door.
What Was on the Site Before Construction?
Before Summit went up, the site held a mix of surface parking lots, low-rise commercial buildings, and leftover infrastructure from a former transit station. Redeveloping land with that kind of buried history, right above and next to Interstate 5, added engineering headaches a clean greenfield site never would have. Coordinating the structure with the highway running beneath it turned out to be one of the harder technical problems on the whole job.
Seattle Convention Center Architect vs. Other Major U.S. Convention Venues
It helps to put Summit next to its peers. Chicago’s McCormick Place is bigger overall, but it’s split across several separate buildings linked by shuttle buses and skywalks rather than one connected structure. Las Vegas takes a similar horizontal approach, prioritizing flat, single-level load-in for trade shows over any real connection to the street. Summit trades away some of that flat-floor convenience moving freight and heavy equipment vertically is never as simple as wheeling it across one level in exchange for a much smaller footprint and a straight walk to downtown hotels and Pike Place Market.
That tradeoff won’t work for every event. Big trade shows hauling in heavy machinery still tend to prefer flat, single-level halls, and that’s not going to change. But for meeting-heavy conferences and mid-size conventions where attendee experience counts for more than forklift access, going vertical gives Seattle a real edge over cities still locked into the old horizontal playbook.
Is the Summit Building the First High-Rise Convention Center in the U.S.?
Based on how the design team itself frames the project, along with coverage from architecture press, yes Summit is widely cited as the first high-rise convention center built in North America. That claim rests on the scale of the vertical program specifically: stacking a full slate of major event floors around one central atrium, not just having more than one story, which plenty of older centers already technically do in limited ways.
Conclusion
The Summit Building shows what happens when a design team treats a tight site as the actual design brief instead of an obstacle to work around. LMN Architects took a cramped four-block lot and turned it into what’s now called North America’s first high-rise convention center, folding in regional art, a dramatic atrium, and direct ties to three surrounding neighborhoods along the way. Planners get a downtown-adjacent venue with real street life around it. The city gets civic infrastructure that adds density instead of eating it up which is rarer than it should be.
Frequently Asked Questions
Who is the architect of the Seattle Convention Center?
LMN Architects designed the Summit Building, the newer addition to the Seattle Convention Center campus. The original Arch building nearby was designed by a different team decades earlier.
How much did the Seattle Convention Center expansion cost?
The Summit Building is widely reported at roughly $2 billion, covering design, construction, and site work across its four-block footprint.
When did the Summit Building open?
LMN Architects marked the building’s completion in early 2023, and it opened for events shortly after, complementing the original Arch building about a block and a half away.
Why is the Summit Building called a high-rise convention center?
Because its event spaces stack vertically across multiple levels instead of spreading across one giant floor plate the approach that let the whole project fit onto a tight four-block urban site.
