The Broncos finalized a sale agreement to purchase Burnham Yard from the Colorado Department of Transportation as the proposed location for a new stadium and mixed-use entertainment district. The NFL team agreed to pay $45.8 million to acquire roughly 58 acres from CDOT in March. The deal is expected to close this fall. It is the formalization of a “conceptual agreement” the Broncos made back in September to buy the historic railyard located south of Colfax Avenue and east of Interstate 25. “As part of the sale process, the state received the proceeds that will ensure our obligations to lenders are fully covered,” CDOT spokesperson Matt Inzeo told The Denver Gazette. “We look forward to continue working together on remaining steps.” Burnham Yard remains the “preferred site” as the Broncos work toward securing the entire 150-acre parcel for their privately financed stadium and entertainment district. That includes other public and private transactions and the partial relocation of Denver Water facilities.…