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503 Westlake Ave N
Seattle, WA 98109
Office Property for Lease · 6,303 SF

Sublease Highlights

  • Prominent frontage on Westlake Avenue North within South Lake Union.
  • Surrounded by tech campuses, life sciences companies, and modern residential communities.
  • Situated in a vibrant hub that includes restaurants, services, and public waterfront spaces.
  • Excellent pedestrian and transit connectivity via Seattle Streetcar and major bus routes.
  • Convenient access to I-5, SR-99, and regional road networks.
  • Located in a high-demand growth district with sustained development momentum.

Property Overview

503 Westlake Ave N is located along Westlake Avenue in Seattle's South Lake Union district, an area anchored by Amazon headquarters and multiple technology and research companies. The property is near regional transportation options including the Seattle Streetcar and close to arterials connecting to I-5 and SR-99. Surrounding development consists of high-rise apartments, mixed-use retail, and commercial offices. Nearby amenities include restaurants, waterfront parks, and access to Lake Union.

  • Bicycle Storage
  • Shower Facilities

Property Facts

Building Type
Office
Year Built
2017
LoopNet Rating
4 Star
Building Height
5 Stories
Building Size
38,880 SF
Building Class
A
Typical Floor Size
7,776 SF
  • Listing ID: 26613083

  • Date on Market: 2026-05-13

  • Last Updated:

  • Address: 503 Westlake Ave N, Seattle, WA 98109

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