If a buy a 2 key house. Live in the main part and rent the granny flat out, can I treat the granny flat as an IP? Say floor space is 20% GF and 80% PPOR. Can I split the loan to have one PI loan of 80% of the value and a secondary loan IO for 20 percent of the value? The plan would be to treat the GF exactly like an IP. Does this kind of financial setup work or is legal?