The Union Stables Building is a rare remaining example of a once common building type, the urban horse stable. Constructed in 1909, the four-story, unreinforced masonry and heavy timber building was designed as a boarding house for many of Seattle’s working horses in the area around the newly-built Pike Place Market. After cars and trucks replaced horse-powered transport in the 1920s, the building was used as a parking garage, an auto body shop, and then a furniture warehouse. As both a historic preservation and an adaptive re-use effort, this project restored the Landmarked building facade, added a completely new fifth floor, and transformed the interior for contemporary office use. The project was designed to meet LEED Gold and the exacting standards of the Federal Government’s Certified Rehabilitation Program administered by the National Park Service. The exterior masonry and terracotta were repaired and restored, and new replacement windows were installed that are consistent with the design and configuration of the original windows. A full structural renovation and a seismic retrofit was performed, and entirely new exit stairs, elevator, restrooms, and mechanical and electrical systems were installed.