I moved from my residence to a new home at mid year 2012 and rented out the property for the last half of the year and continue to rent it out. Can I treat it as my residence for half a year in 2012 and a rental for half a year in 2012 or must I treat it as a mixed-use property for 2012 and a rental property in 2013 if it remains a rental all of 2013?