CAMDEN, Maine — Investigators on Monday continued to look for a cause of the fire that ripped through the Bayview Landing construction project the evening of Dec. 23.

Sgt. Ken Grimes of the State Fire Marshal’s Office said his office has not been able to link all the evidence to determine a cause.

“There was a portable space heater, but we can’t say yet whether that caused the fire,” he said.

He said the investigation remains open.

The fire was reported at 5:50 p.m. Dec. 23. Firefighters arrived within minutes, and aid came from Rockland, Rockport, Lincolnville and Hope fire units.

The wooden-frame structure was adjacent to the town landing in the center of the downtown business district. The landing had been under construction for about three months. It was to house a 150-seat restaurant on the first floor and a 10-room inn on the second floor.

Camden Fire Chief Christopher Farley said rebuilding could begin as soon as the fire marshal and insurance inspectors finished their investigations.

According to the code enforcement office, the building permit issued for the structure valued it at $600,000.

Property owner Stuart Smith told Farley that he intended to rebuild as soon as possible.