then you change the property to business asset for 3 month, use schedule E you can deduct 3 month of interest, tax, 3 month of insurance, and other repair cost, then deduct your partial depreciation (3month).
later if you sell this property, you need to report it as sale of business property, not as your primary home.
this is base on my limit knowledge on renatls, please consult a tax professional for more detail.