City leaders said four workers continued construction on the hazardous structure along the 300 block of East 9th Street without permits, putting themselves and nearby residents at risk. Two of the workers suffered only minor injuries in the collapse.
"I'm just glad nobody was killed," neighbor Risa said.
A Ring camera captured the sound of the building giving way as smoke and debris filled the air. Fire Commissioner John Paul Shirley compared the unstable structure to a teetering stack of blocks.
"Just given the state of the condition of the building, it's kinda like a Jenga block. You pull out one Jenga block and just causes it all to collapse," Shirley said.
Shirley said the home had already been deemed unsafe, and the crew ignored stop-work orders issued last week.
"It's extremely dangerous for them; the weight of all the structural members can easily kill someone," he said. "The fact that it's attached to a property, that collapse could cause a secondary collapse."
Four people lived in the adjoining home, but only one was inside at the time. All residents are now displaced until the building is stabilized and code violations are addressed. The American Red Cross is assisting them.
"Somebody has to be held accountable," Risa said.
Neighbor Alexa Simmons said the city must enforce its safety directives.
"I think we have to see those stop-work orders through and ensure people are obeying them," she said.
Shirley said the contractor is expected to face fines, and an investigation is underway. He urged residents to stay away from the site as the city moves quickly toward demolition.
"Just take it down, start something new," Simmons said.
"Clean it up and rebuild like a lot of the old houses in the city. I'm hoping they tear down and rebuild," Risa added.
Shirley said Chester is working proactively to demolish hundreds of dangerous buildings, though each demolition costs about $50,000. He did not have a timeline for when the displaced residents might return home.