Thanks for your reply!
If I report the casita as a new property, it will definitely help me in terms of allocating costs and income. Both units are similar, but not identical in size (650 sq ft and 890 sq ft). Is it okay to divide the shared costs by 2, including property taxes, insurance, landscape maintenance, and shared utilities? The rent charged is the same, since the smaller one is the new building (nicer inside!).
When I sell the property, will this complicate the tax calculations?
