Office complex addition burned on Tucson's east side

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TUCSON, Ariz. -- Labor day started off on the wrong foot for some Tucson business owners.

Firefighters were called out to battle a huge fire in an office building on the east side.

It was supposed to be a new addition to an east side business park, But around 4:00 Monday morning it went up in flames.

"Well we had an ambulance crew that was transporting a patient to the hospital nearby when they saw smoke coming from the roof area," said Capt. Trish Tracy from the Tucson Fire Department.

It took more than twenty firefighters to tackle the fire.

"I came down here as quick as I could to make sure it wasn't my office that was burning," said Kenneth Thueson, DDS.

Thueson stopped by to check his dental office.  Everything was fine.

The building closest to the fire lost power, but a contractor working on-site was trying to fix that.

"They just started in the last couple weeks working, I heard it was supposed to be a Marana Healthcare or something,"

The fire caused about $400,000 in damage.  TFD says early morning fires pose a unique problem for firefighters.

"They're also the hours when fires are the largest for us because they have time to progress without someone noticing," said Capt. Tracy.

Investigators are still trying to figure out what caused the fire.  Right now the structure is not safe enough for them to enter.