Add to ORKGPhotograph used for a story in the Daily Oklahoman newspaper. Caption: "Imagine the size of a building that covers an area of 575,000 square feet. If that's too hard to visualize, then consider the same building contains 82,350 cubic yards of concrete - enough to pave a highway 24 feet wide from downtown Oklahoma City's major buildings on the area occupied by the building. Pretty big, huh? We're referring to Oklahoma City's downtown convention center, which is now under construction on its four-square-block site. The $22.9 million center will eventually occupy three-fourths of the area bounded by Sheridan Ave., W Reno, S Robinson and the Santa Fe tracks.