Fire investigators were unable to determine the cause of a fire that destroyed a two-story home on Makiki Heights Tuesday.

The home at 2182 Round Top Drive was being rented by a couple while their home, next door at 2186 Round Top Drive, was being renovated. The fire broke out about 12:25 p.m. and was extinguished at 2:05 p.m.

The fire investigator said the cause of the fire has been classified as "undetermined," said Capt. Terry Seelig, Honolulu Fire Department spokesman. He said the extent of damage to the home was so great that it was difficult for the investigator to pinpoint a cause.

Damage to the building and its contents was estimated at $650,000.