I have a row of six storage hangars. Currently, there is a 1-hour separation between each hangar and they are anywhere between 3400 - 4200 square feet. The outside walls are 2-hour rated and the offices inside each hangar are 1-hour rated. Is each individual hangar considered a separate fire area? If so, would I calculate the allowable square footage for each hangar as a Group III since it is storage only and no service or fuel or would it be the cumulative under roof square footage of 23,814; which I believe would bump it up to Group II hangar?