Police are asking for any information about a fire Sunday night at the Elgin Tower Building.
As a result of the damage caused by the fire, the 1929 building at 100 E. Chicago St. was condemned by the city, and its remaining three tenants had to move out.
Elgin Fire Chief John Fahy said earlier this week the fire was set intentionally, causing damage to the lobby and both elevators.
Officials said it appeared miscellaneous items were on fire, including a trash can, officials said.
Elgin Fire Department Battalion Chief Terry Bruce said firefighters found the front lobby door's glass broken.
"Police got a hold of the witness. He said when he spotted the fire inside the building, the door was broken," he said.
The investigation into the fire could take up to a few weeks, Bruce said.
Elgin Police Cmdr. Dan O'Shea said police had no comment about the ongoing investigation.
Police are asking anyone with information to contact the major investigation division at (847) 289-2600.
People also can provide anonymous tips or information via the crime line at (847) 695-4195 or texting 847411 and including ELGINPD in the beginning of the text, along with the tip.