Hello - I have a similar situation. I converted my garage to an apartment which was placed in service and has been rented out all of 2017. Expenses for the construction were occurred in 2015 and 2016 but were not deducted previously. How do I establish the value for depreciation? Do I need to enter the value of the primary residence or can I just enter the amount I spent for construction as the value for the new 'asset'?
