On May 2, 1911, the Firland Sanatorium constructed by the Anti-Tuberculosis League of King County at 19303 Fremont Avenue N (Shoreline) opened as the Henry Sanatorium. The railroad magnate Horace C. Henry, whose son died of tuberculosis, provided the land and initial funding for the Sanatorium.

The Firland became the city of Seattle’s municipal tuberculosis hospital. Tuberculosis was the leading cause of death in Seattle at that time.