- For Lease Contact for pricing
- Property Type Office - General Office
- Property Size 657,531 SF
- Lot Size 0.84 Acre
- Parking Spaces Avail. 414
- Parking Ratio 0.63 / 1,000 SF
- Property Tenancy Multi-Tenant
- LEED Certified Platinum
- Building Class A
- Year Built 1980
- Date Updated May 22, 2026
Description
One Union Square is a 657,531-square-foot Class A office building, situated on a 0.84-acre lot in the heart of the Seattle Central Business District. The property boasts Platinum LEED certification, reflecting its commitment to sustainability, and includes 414 parking spaces with a ratio of 0.63 per 1,000 square feet. Tenants benefit from a professional environment designed for productivity, complemented by modern amenities and an excellent location.
Surrounded by an array of conveniences, the property is within walking distance of multiple public transportation hubs, including the 5th Avenue & Pine Street bus stop approximately 0.2 miles away and Pioneer Square Station approximately 0.5 miles away. Dining options abound nearby, with establishments such as MOD Pizza and Cortina less than 0.1 miles away. Several hotels, including the Hilton Seattle and Sheraton Seattle, are just steps from the building, adding convenience for out-of-town visitors. Nearby educational institutions like the University of Washington’s Professional & Continuing Education center, located 0.2 miles away, and Seattle University, approximately 0.7 miles away, further enhance the area's vibrant appeal.
True
32 Spaces Available
#1
Retail
Contact for pricing
1,812 SF
1
1,812 - 1,812 SF
Immediate
Yes
No
#1100
General Office
Contact for pricing
18,832 SF
11
18,832 - 18,832 SF
Immediate
Yes
No
full floor
#1312 & 1400
General Office
Contact for pricing
28,367 SF
28,367 - 28,367 SF
Immediate
Yes
No
COMBINED SUITES 1312 & 1400.
13-14th Floor
#1500
General Office
Contact for pricing
9,731 SF
15
9,731 - 9,731 SF
Immediate
Yes
No
elevator lobby exposure
#1515
General Office
Contact for pricing
2,721 SF
15
2,721 - 2,721 SF
Oct 1, 2026
Yes
No
Contacts
Washington Holdings
Washington Holdings
Washington Holdings
