SURFSIDE, Fla.—The death toll in the collapse of a Miami-area condo building rose to 79 on Friday, a number the mayor called “heartbreaking” as recovery workers toiled for a 16th day to find victims in the rubble. Another 61 people remain unaccounted for. Miami-Dade Mayor Daniella Levine Cava said the work to recover victims was “moving forward with great urgency” in order to bring closure to the families of victims who have spent an agonizing two weeks waiting for news. “This is a staggering and heartbreaking number that affects all of us very deeply,” Levine Cava said of the latest death toll. “All those who have passed … are leaving behind loved ones. They’re leaving behind devastated families. The magnitude of this tragedy is growing each and every day,” she said. Rescue workers and emergency support teams from Florida and several other states have labored in 12-hour shifts, 24 hours …