Good question. That is what I am trying to determine. There are about 15 or 20 of these and they are proposing 3 or 4 more. Very similar to the roadside motel picture that someone posted earlier in the thread (maybe even you). Which raises the question, why can't they be classified as IRC structures and built under that code?
Contrary to what Brudgers may think, I am not set in my way and trying to jackbootedly impose unreasonable requirements on anyone. I am trying to determine the best application of the code. My mind is not made up and I am only seeking to resolve this question before they come in and submit for permit.
I did find a Washington State Building Code Interpretation
go to
https://fortress.wa.gov/ga/apps/sbcc/Page.aspx?nid=70
and read Interpretation # 10-02
They pretty much answered that you could potentialy use the IRC, but the R1 IBC would be more appropriate.