As I understand it, unless you close on January 1st, you will have additional depreciation for 2018 so 2018 Current Depreciation off of Form 4562 must be added to Prior Depreciation to establish your basis. Common sense dictates that the property, and all the other depreciating items listed on f4562, continued to lose value during 2018.
When you tell TurboTax when you sold or disposed of the property (closing date in June 2018) it will calculate 2018's depreciation up to that date.
