Investors & landlords

1)  how does the live-in landlord file the blank 2 of the personal use days? You don't. You are dividing by space, not by time. This is not a vacation home.

2) and what the type of property for the condominium? (there is only single family / multi family.) Multi family. 

3) Do I also need to file the schedule A for my own partial mortgage interest deduction?  Yes and the property taxes, too.

4) Could we separate the mortgage interest/depreciation and rental income randomly or equally? Divide by the square footage. Any common areas count as personal space.

If the screenshot below appears, choose the fourth option.