Pioneer Square · Seattle

Verified Data Updated March 2026

Jackson Square

121 S Jackson St

1902
Year Built
7
Total Units
Mid-Rise
Type
Jackson Square condominiums in Pioneer Square, Seattle

Jackson Square: Key Facts

Building: Jackson Square
Address: 121 S Jackson St, Seattle, WA
Neighborhood: Pioneer Square
Year Built: 1902
Total Units: 7
Type: Mid-Rise
Walk Score: 97
Transit Score: 100

Profile by Jeff Reynolds, Seattle Condo Specialist · Compass Real Estate · 20+ years, 500+ transactions

Verified Updated March 2026

About Jackson Square

Jackson Square is a Mid-Rise building in Pioneer Square, Seattle. Built in 1902 with 7 residences.

Building Details

Jackson Square is a historic condominium building in Pioneer Square, Seattle. The building takes its name from Jackson Street, one of the major east-west corridors that defines the southern edge of Pioneer Square and its boundary with the International District and SoDo.

Pioneer Square’s Jackson Street corridor is historically significant as both an early commercial artery and as a zone of transition between the neighborhood’s historic core and the adjacent districts. Buildings along and near Jackson Street in Pioneer Square represent a cross-section of the neighborhood’s architectural history from the late 19th century through the mid-20th century.

Historic condo buildings in Pioneer Square are part of the neighborhood’s effort to maintain and activate its remarkable stock of brick and timber commercial structures. Jackson Square is part of this inventory of residential conversions that give the neighborhood its residential density and character.

Specific data for Jackson Square including address, year built, and unit count has not yet been confirmed in the Seattle Condo Authority Network’s dataset. Contact Jeff Reynolds for current listing information, recent comparable sales, and HOA financial disclosures.

Key factors every buyer should evaluate before making an offer at Jackson Square. Jeff Reynolds reviews these items as part of every buyer consultation for this building.

Frequently Asked Questions

What is Jackson Square in Pioneer Square? +

Jackson Square is a historic condominium building in Pioneer Square, Seattle, near Jackson Street.

How many units does Jackson Square have? +

Unit count data for Jackson Square is not currently confirmed. Contact Jeff Reynolds for current building information.

What year was Jackson Square built? +

Year of construction has not been confirmed for Jackson Square in our dataset.

What are HOA fees at Jackson Square? +

HOA fee data is not confirmed for Jackson Square. Contact Jeff Reynolds or request disclosures from the HOA.

What other Pioneer Square buildings are nearby? +

Pioneer Square historic condo buildings include Olympic Block (1893), Our Home Hotel (1907), Art Stable (1905), Market Court, and Banner Building.

Jeff Reynolds, Seattle condo specialist

Jeff Reynolds

Seattle Condo Specialist · Compass Real Estate · 20+ Years

Jeff Reynolds has spent 20+ years exclusively focused on Seattle's condo market, closing 500+ transactions and personally profiling 202+ buildings. His building-level expertise, grounded in HOA financials, reserve fund health, construction quality, and resale performance, is the foundation of every recommendation on this site. Have a question about Jackson Square?

Ask Jeff About Jackson Square

Or call directly: 206-794-1118 · jeff.reynolds@compass.com