Secure Storage in Hillsboro was damaged by fire Sunday.
The owner of the unit where the fire started called 911.
Firefighters on Engine 5, Truck 5 and Engine 6 arrived to find flames coming from 6 units on the end of the building with the fire spreading to more units.
After 20 minutes of cutting through the metal doors of 18 storage units, and spraying water on the fast moving flames firefighters had the fire under control.
A Hillsboro Fire Investigator is working to determine the cause of the fire.
A total of 25 Hillsboro Fire personnel responded to the fire. No firefighter injuries were reported.