You can only change the cost basis and deprecation of your rental property by amending your past returns. As you can amend only three years from the due date of the return, you can only amend tax years 2014, 2015 and 2016. Note that you need to amend your 2014 return before April 15, 2018. You can no longer amend your 2013 return.
You need to amend the earliest year first.
To amend, please follow these links:
https://turbotax.intuit.com/personal-taxes/cd-download/amend/ty16/
https://turbotax.intuit.com/personal-taxes/cd-download/amend/ty15/
https://turbotax.intuit.com/personal-taxes/cd-download/amend/ty14/
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