Records of the Office of Management and Planning, Planning Department and Office of Management and Budget concerning planning for the Seattle Commons and the South Lake Union area. The Seattle Commons was a proposed boulevard and park which would have stretched from Westlake Center to Lake Union, but which was defeated by voters in 1995. The planning also encompassed the Mercer corridor and surrounding South Lake Union neighborhoods. Records include correspondence, draft plans, studies, maps, subject files and documentation from earlier South Lake Union planning projects.