Principal, Gustave Eckloff, Building Contractor, Seattle, WA, c. 1901; in 1901, his business address was the rear of 1013 3rd Avenue.

In 1901, Eckloff and his wife lived at 2233 Boylston Avenue in Seattle.

A relative, Axel M. Eckloff, who worked as a carpenter, resided with Gustave at 2233 Boylston Avenue in 1901. Another Eckloff, John, an engineer, lived in Seattle at the time, although it is unclear if he was related. John Eckloff stayed at the Hotel Butler in 1901.

Eckloff married Hulda Anderson.

Eckloff and Hulda Anderson had a daughter born on 10/17/1901.