A representative of the firm Con-Struct says the demolition work on the Saint Mary`s property will take some three weeks to be completed. Spokesman, Matt Jensen says the gym, the school and the convent all are coming down. He says approximately nine to ten workers are on the job utilizing hydraulic excavators, dump trucks, and skid loaders. Jensen says that even though the closure of Linn Street from First to Center Streets will be lifted Saturday at noon, the work will go beyond that time frame.