Jackson Square

The Building Story

A compact warehouse building on Occidental Avenue

Jackson Square occupies a two-story brick building at South Jackson Street and Occidental Avenue South. Completed in 1902, it housed the Seattle Transfer Company and later Scientific Supplies. The city’s historical inventory describes heavy timber construction behind thick masonry walls, with a straightforward commercial facade and a series of arched openings along the Occidental side.

The building is now a mixed-use condominium property. Records use 123 South Jackson for the building, while residential units also appear under 121 South Jackson. Keeping those addresses together matters when reviewing available homes and sales history. Jackson Square’s modest height and warehouse origin distinguish it from the neighborhood’s larger loft conversions. For buyers, the useful questions are specific to the residence: how its windows meet the street, how the interior has been adapted and how residential access relates to the commercial portions of the property.