Investors & landlords

@view2 , if i use number of room method to divide expense, should i use the same percentage when doing depreciation? say, i have total 3 rooms and rent out 1 bedroom, which is 33% rental percentage but maybe only 10% if used square footage method, so when doing depreciation, should i use same 33% or i could only using square footage method, thus 10% of my total house cost for depreciation? thanks.