Built in 1910, the Post Street substation served the needs of the city's growing electric grid as well as the surrounding area.

[2] The substation initially delivered power to Spokane's street light and streetcar system, as well as to the growing number of electrified household appliances in the city.

[8] The Post Street Electric Substation is of brick construction and a concrete base[2] with a foundation on the stony south bank of the Spokane River.

[1] As part of Cutter's early contributions to the Spokane downtown landscape, the building is definitive of the area's architectural identity.

Originally the substation had skeletal dome frames atop each corner of the building, each flying an American flag.