Well, CDC seems to think it's a possibility.
https://www.cdc.gov/cpr/zombie/index.htm
https://theconservativetreehouse.com/blog/2021/06/24/champlain-towers-collapse-sunrise-florida-unknown-number-of-fatalities-99-people-missing/
Check this out:
"Surfside Commissioner Eliana Salzhauer said “the building was undergoing a required 40-year recertification to ensure its structural integrity, and that the building’s roof was being redone. She added that residents told her a building inspector had visited Champlain Towers on Wednesday, but she did not know what the inspector found. It is unknown if any construction activity contributed to the disaster.” (Miami Herald Article Link)"
https://theconservativetreehouse.com/blog/2021/06/24/champlain-towers-collapse-sunrise-florida-unknown-number-of-fatalities-99-people-missing/
If the building had people in it to "re-certify" it, could they have been doing some other things there?