Demolition of Mason Center set for Monday Durango, Colorado Sat Adjacent sidewalk and parking to close during demolition Demolition of the main building at Mason Center Park will begin Monday. Courtesy city of Durango Demolition of Mason Center set for Monday Demolition of the main building at Mason Center Park will begin Monday. Courtesy city of Durango Escuchar en Español: Loading the Español audio player... The city of Durango will begin demolition of the building at Mason Center Park, 301 East 12th St., on Monday. Demolition and site restoration work will tentatively be complete June 4. The project will remove the existing two wings of the building and parking area and stabilize the site with irrigation and sod. The existing gymnasium structure, tennis courts, playground and park area will remain in place.