for the 2014 and 2015 seasons, the minnesota vikings of the national football league (nfl) used tcf bank stadium as their home venue while their new venue, u.s. bank stadium, was under construction at the site of the metrodome. to help accommodate the vikings, tcf bank stadium underwent several changes, including a new playing surface with heating coils, increased storage space throughout the stadium, and concession upgrades. in addition, temporary seats were installed that increased the stadium's capacity to 52,525. these accommodations were expected to cost about $7 million - an amount attributed to the overall construction cost of the new stadium