All residents of the second building, Crestview Towers, were immediately told to leave after engineers found serious concrete and electrical problems in it.
126 residents of the collapsed Champlain Towers are still missing and may have perished in the rubble.
The disaster occurred in the oceanic town of Surfside, Florida, near Miami Beach.
Investigators have not found the cause of the collapse of the 40-year-old building in what is considered the worst construction disaster in US history.
But an engineering report prepared in 2018 before the building's safety re-authorization identified structural defects that are the focus of investigations now into the cause of the collapse.
The head of the building's residents' union warned its occupants in April 2021 that the damage the report revealed to the concrete was "significantly worse".