Dave Keefe, the owner of The Original Brooklyn’s just south of Empower Field, has witnessed the evolution of the neighborhoods around the Broncos’ stadiums over the 41 years he’s operated his restaurant at the corner of Old West Colfax Avenue and Morrison Road. Like many, he’s unsure what the area’s future holds, now that the Broncos are exploring building a new stadium elsewhere. But there is one thing he’s positive of should Empower Field cease to be the Broncos’ home: Sun Valley will be OK. “If they leave, this is going to be the biggest empty hunk of land in the central part of Denver that’s undeveloped,” Keefe said as he pointed toward the stadium and its lots packed with tailgaters.