Seattle: The Arch (705 Pike Street)#

Opened: 1988. Exhibit space: 236,700 sq ft. Walk Score: 98. Transit Score: ~100.

The Washington State Convention Center’s original building sits on a freeway lid over I-5 at Pike Street and 7th Avenue — the geographic center of Seattle’s contiguous walkable core.

What Was Here Before#

On June 1, 1961, protesters marched along the proposed I-5 route carrying signs reading “Block the Ditch” and “Let’s Have a Lid on It.” Architect Paul Thiry proposed lids. All were rejected by state planners. I-5 opened in 1967 after demolishing roughly 6,000 homes across its Seattle route, severing Capitol Hill and First Hill from downtown.

Seattle: The Summit (900 Pine Street)#

Opened: January 2023. Exhibit space: 149,200 sq ft (573,770 sq ft total). Walk Score: 98. Cost: $1.9 billion.

North America’s first high-rise convention center, one block northeast of the Arch.

What Was Here Before#

A Honda auto dealership ($56.5M, purchased 2014), Convention Place bus station ($275M, purchased 2017), and other commercial buildings. Part of the historic Pike/Pine “Auto Row.”

Convention Place was the northern terminus of the Downtown Seattle Transit Tunnel (opened September 15, 1990). It was permanently closed July 21, 2018 to make way for Summit construction.

Boston: Hynes Convention Center (Back Bay)#

Opened: 1988 (replaced 1963 Hynes Auditorium). Exhibit space: 176,480 sq ft. Walk Score: 97.

The convention center the neighborhood fought to keep.

What Was Here Before#

The Back Bay was tidal mudflats until the 1850s–1880s landfill (gravel brought by rail from Needham, 24 hours a day at peak). The Hynes site, in the western portion near Gloucester and Dalton Streets, was filled around 1871–1880. For the next 70+ years, the site was occupied by Boston & Albany Railroad rail yards — freight operations, coach storage, and maintenance facilities. The residential brownstone grid of Back Bay (Commonwealth Ave, Marlborough, Beacon) developed to the north; the rail yards were the southern boundary.

Boston: BCEC / Menino Center (South Boston Seaport)#

Opened: 2004. Exhibit space: 516,000 sq ft contiguous. Walk Score: 62.

What happens when you build big on empty land.

What Was Here Before#

Underutilized industrial piers and derelict waterfront. The state used eminent domain to assemble a 60-acre site. A lost 1999 plan by Cooper Robertson proposed smaller blocks, a network of parks, and “active street fronts” — killed by political opposition and post-Big Dig budget constraints.