Engineering firm executive Sinisa Kolar’s phone has been ringing off the hook since the deadly collapse of Champlain Towers South in Surfside, Florida.

“Let’s put it this way, since this started, I’m actually not doing anything — I’m just answering phones and talking to people,” Kolar said of the influx of concerned calls that his Miami-based company, the Falcon Group, has received since the 12-story beachfront condominium came crumbling to the ground in the early-morning hours of June 24.