SURFSIDE, Fla.—Rescue efforts at the site of a partially collapsed Florida condominium building were halted Thursday out of concern about the stability of the remaining structure, officials said. Search crews that have been atop the pile of rubble for the last week stopped work shortly after 2 a.m., Miami-Dade County Mayor Daniella Levine Cava told a news conference. The stoppage came on the same day that crews and relatives of those still missing were scheduled to meet with President Joe Biden in a visit that many hoped would provide some measure of comfort to a devastated community. Biden and first lady Jill Biden planned to thank first responders and search and rescue teams. They also planned to meet with the families of victims, White House press secretary Jen Psaki said. The president’s visit comes a week after Champlain Towers South, a 12-story beachfront condominium building in Surfside, suddenly came crashing …