Just got finished with an audit of a 2015 1031 exchange.
Apparently, when the return says Self-Prepared, along with an exchange, the taxpayer is like shark bait for Auditors.
Be sure and keep all depreciation schedules and exchange information forever; we got a request for the schedules from 2004, which was also a 1031 exchange into property in question.
I had the 2015 exchange computations done by my CPA when it was originally filed, so I was able to provide the complicated documentation. The 2004 data had to be reconstructed by my CPA, big $$$$ for time.