A Cutting-Edge Class A Life Science Hub


307 Westlake Ave, Seattle, WA 98109

Discover 307 Westlake, an innovative, multi-tenant building crafted to empower life science companies with adaptable growth opportunities. This conveniently located property is situated in the heart of South Lake Union’s vibrant marketplace.

  • ±128,000 RSF
  • Exceptional building systems, inviting outdoor terraces
  • Convenient public transit access, including a well-placed streetcar stop in front of the building
  • 5-story, Class A Lab building
  • Spectacular views of Lake Union and Seattle
  • On-site parking


Floor 5 Floor 4 Floor 3 Floor 2 Floor 1 25,000 SF Available Available 26,000 SF LEASED Available 28,000 SF 12,000 SF Available Available – Storage 4,000 SF Building Conference Center P arking P arking

Floor Plans

±12,000 rsf

±28,000 rsf

±26,000 rsf

±25,000 rsf

The Perfect South Lake Union Location

Local Amenities

307 Westlake is ideally located in South Lake Union and within walking distance to hip restaurants, retail amenities, water activities, SLU Park, Light Rail, convenient public transportation, and Dexter Avenue bike lane.

South Lake Union’s nearby open spaces frequently hold public events and markets for shopping and entertainment. Open plazas also feature performing arts, including music, acting, and artwork displays.

Building Amenities

  • Single floor plates to accommodate both small and larger tenants
  • Conference center
  • 116 secure on-site below-grade parking stalls
  • On-site café and coffee house
  • Secure bike storage and shower facilities
  • Views of Lake Union, the Space Needle, and downtown Seattle
  • Two passenger elevators and one freight elevator

The BioMed Realty Difference

BioMed Realty, a Blackstone real estate portfolio company, is a leading provider of real estate solutions to the life science and technology industries. BioMed owns and operates high quality life science real estate comprising 16.8 million square feet concentrated in leading innovation markets throughout the United States and United Kingdom, including Boston/Cambridge, San Francisco, San Diego, Seattle, Boulder, and Cambridge, U.K. In addition, BioMed maintains a premier development platform with 2.7 million square feet of Class A properties in active construction to meet the growing demand of the life science industry. 

We are fortunate to have a world-class sponsor in Blackstone, a strong believer of long-term market fundamentals of the life science industry. Since 2016, Blackstone and BMR have been actively investing in developing, modernizing, and expanding research facilities in our core innovation markets. Blackstone’s conviction means we can also provide a substantial community benefit. 

16.8M SF owned and operated

2.7M SF of Class A properties in active construction

28M SF available to accommodate tenants

300+ in-house experts

250+ tenant partners

People at a business meeting in a modern office

Leasing Contact