Fourteen more victims have been recovered in the Surfside condo building collapse, bringing the confirmed death toll to 78, Miami-Dade County Mayor Daniella Levine Cava said at a press conference Friday.

"This is a staggering and heartbreaking number that affects all of us very very deeply," she said.

Forty-seven of the 78 victims have been identified, and another 62 people are potentially unaccounted for.

Work at the site in Florida, just north of Miami Beach, is focused on recovering victims and trying to bring closures to the families of those who are missing.

Over 13 million pounds of concrete and debris had been removed from the site as of Friday, according to Levine Cava.

Dr. Christopher Valerian, medical manager for New Jersey Task Force 1, an urban search and rescue team that was deployed to the collapse site, said the Surfside collapse site isn't typical.

"Usually in a building collapse like this you will find what we call void spaces, you know, spaces that are created by objects that stop the falling debris above your head, and that's sort of where you find victims," he said Thursday on CBSN. "In this particular case, and I'm not a structural engineer, however, the way it's been explained to me is that the way that the building sort of pancaked down and the pressure from the floors above just created so much downward force that those normal void spaces where survivors would be located just don't exist."

Valerian said a lack of large household appliances at the site is another indicator of how powerful the collapse was. 

"I've said to myself, 'Where are all the appliances? Where's the refrigerators, the stoves, the ovens?'" he said. "We're just not finding, like, large objects. All we're finding are small, crushed, pulverized pieces of metal and concrete and steel, so it's just amazing the force this building fell at, and I think that's part of the problem with not being able to find survivors."

The disaster occurred on June 24 around 1:15 a.m. local time at the Champlain Towers South condominium in the small, beachside town of Surfside, about 6 miles north of Miami Beach.

Approximately 55 of the oceanfront complex's 136 units were destroyed, according to officials. The rest of the building was demolished on Sunday night, due to concerns about its structural integrity and an incoming tropical storm.

For two weeks, hundreds of first responders carefully combed through the pancaked piles of debris in hopes of finding survivors. But no one has been found alive in the wreckage of the building since the morning it partially collapsed, and officials announced Wednesday evening that the search and rescue operation, in its 14th day, would shift to a recovery mission.

Surfside Mayor Charles Burkett told reporters that the decision was "a result of a consensus by those closest to the rescue efforts that the possibility of someone still alive is near zero."

(With input from agencies)