Lake Union Park is a 12-acre park located at the south end of Lake Union in Seattle, Washington in the South Lake Union neighborhood. The park is owned by the City of Seattle and operated by Seattle Parks and Recreation. The park property was gradually acquired by the City, and the final 5 acres were transferred from the United States Navy to the City of Seattle on July 1, 2000. After renovation, the current park space officially opened on September 25, 2010.