I have been trying to determine the occupancy classification of a Hostel. I am using the 2007 California Building Code. It would be a single family dwelling converted into a hostel. The occupants would have full use of the house. So far I can justify R-1 (it is transient in nature), R-2 (it is like a dormitory), R-3 (it is congregate living with 16 or fewer occupants). Does anyone have any ideas? If it is an R-3, would you require any accessible features if nothing is being done to the house?