St. Mark's Cathedral, begun in 1929, is the Cathedral for the Episcopal Church Diocese of Olympia and an architectural monument for the City of Seattle. The Great Depression of the 1930s forced a scaling down of the grand plan for the cathedral, and despite two additions, the cathedral remains incomplete. The Vestry selected Cardwell Architects to prepare a rehabilitation study and master plan that responded to current and future programmatic requirements. The work included a thorough investigative survey of the cathedral, including the building envelope and structural, mechanical and electrical systems.