Go to prior year in the Tax Timeline and access the return for 2015.
You may have to say, "Add a state" to get back into it. You won't actually add a state, but this will allow you back.
Then go to print and save the return with all worksheets. Look for the Depreciation Worksheet for the Rental and print that off. This will show the prior depreciation taken.
The sale needs to be allocated to all the assets on the depreciation schedule and the land.
It may be easier to start over and transfer the prior file back in, if you deleted all the assets on the rental.
I would try the above first, and then you can decide.