Authorities have confirmed that at least 10 people have died after a condo tower collapsed near Miami, coming as the mayor of Miami-Dade County has ordered an audit of buildings that were constructed at least 40 years ago in the area. Rescue workers digging through the rubble have stressed that more survivors may be trapped inside the partially collapsed Champlain Towers South in Surfside, Fla., located within Miami-Dade County. About 150 people are missing. “We have over 80 rescuers at a time that are breaching the walls that collapsed, in a frantic effort to try to rescue those that are still viable and to get to those voids that we typically know exist in these buildings,” Andy Alvarez, a deputy incident commander with Miami-Dade Fire Rescue, told ABC News on Monday morning. Authorities have been able to create a tunnel through the building to find survivors. During a news conference over …