SALT LAKE CITY — Denver-based MediaNews Group has completed the disposition of the former home of Salt Lake City Tribune. The vacant 10-story, 84,300-square-foot office is located at 137-147 S. Main St. in downtown Salt Lake City. 39/42 LLC, an investment group affiliated with Vasilios Priskos of InterNet Properties Inc., purchased the property, which was built in 1924, for $3.9 million. The buyer plans to redevelop the property, which offers 5,000 square feet of storefront along South Main. Tom Lee of Denver-based Frederick Ross Co. represented the seller in the transaction.