Search-and-rescue work has resumed at the collapsed condominium in Surfside, Fla., officials said Thursday evening, after “structural concerns” about the still-standing part of Champlain Towers South brought urgent efforts to a halt early in the morning.

Authorities are moving ahead with plans to demolish the standing building, Miami-Dade County Mayor Daniella Levine Cava said at a news conference, but have yet to make the call and said it will take time. In the meantime, engineers found that search efforts could go on safely.

Earlier in the day, President Biden visited Surfside, speaking with responders and leaders and also spending nearly three hours meeting privately with about 200 people who are survivors or family members of the dead and missing. The conversation was “truly emotional,” Levine Cava said.

As of Thursday night, 145 are missing and at least 18 people are dead, all of whom have been identified.

Here are some significant developments:

  • For so many, survival or likely death came down to a single number: their condo unit.
  • A “few” rescue workers have caught the coronavirus, Miami-​Dade County Fire Chief Alan Cominsky said Thursday night, a development that he said officials will “aggressively keep our eye on.”
  • Potentially complicating rescue efforts is Tropical Storm Elsa, which formed Thursday in the Atlantic Ocean. The National Hurricane Center said Thursday evening that there is a “risk of storm surge, wind and rainfall impacts” in parts of Florida early next week but stressed the forecast’s uncertainty.
  • Biden said he intends to have the federal government cover state and local costs incurred by the catastrophe.
  • Auditors reviewing condo infrastructure in Miami-Dade County have already identified serious problems that could threaten the safety of people living in high-rises across the area, according to an officials and public records.
  • Authorities identified another victim, 80-year old Magaly Elena Delgado.