ANSONIA—The owner of the former SHW Casting Company on North Main Street applied for a permit Friday to demolish the structure, a day after a portion of its roof collapsed.

The building which is owned by Pandel Properties, has contacted Eastern Economic Recycling LLC to conduct the demolition. Meanwhile, authorities are investigation whether salvage work being done may have compromised the structure.

Officials said one person was inside the building when it collapsed, and was unhurt.

City and state fire marshals as well as building engineers and city officials were at the site Friday. They determined that the building, on 3.5 acres at 35 North Main Street, constitutes a hazard to public safety.

“This is a very dangerous situation,” said Mayor David Cassetti, who noted that the building rests alongside the heavily traveled North Main Street which used by both pedestrians and motor vehicles. It is also directly across from the city’s Armory and Eagle Hose volunteer fire company.

“We want this down as soon as possible to prevent anyone from being injured and to avoid damage to city or private property, should there be any additional collapse,” Ansonia Corporation Counsel John P. Marini said.

But Marini said there might need to be environmental remediation on the 128-year-old structure, which had been vacant for several years, before demolition begins.

Cassetti and Marini raised questions as to what the worker was removing inside the building. An investigation is ongoing to determine if his salvage work involved removing structural steel.

“We’re still investigating,” said Interim Ansonia Fire Marshal Darrick Lundeen.

Fire Chief Edward Adamowski said a portion of the roof collapsed around 4 p.m. Thursday.

“There was a worker there, (operating) a machine, but he was not injured,” the fire chief said, adding that about a 150-foot section fell to the ground.

Marini said the building has been vacant for some time, and that the owners owe about $80,000 in taxes. Additionally, the city’s blight enforcement officer, David Blackwell Sr., said he cited the building for at least seven violations, including broken windows and roof damage in 2014.

“We’ve been working with the property owner’s counsel,” Marini said. “They told us they were going into remove vehicles and the owner’s property. If they were doing anything more than that, as it appears, that’s a big no-no.”

SHW purchased the building and the Farrel Corp’s roll division in 1985, when the company expanded to North America, according to its website.

In 1991, SHW moved to a 50,0000-square-foot, specially designed factory in Torrington. In 2000 the company sold the Ansonia building to Pandel for $60,000, according to Sheila O’Malley, the city’s economic development director. Angela Pantalone, a former city resident who now lives in Woodbridge, is the firm’s principal. She did not return calls for comment Friday.