I also agree that everyone needs to know how to manage risk, but you can't manage risk on your first deal if you only have cheerleaders and no impartial third party.I edited it as it posted too quick.

I have been able to review or been told of several audits (from other REI tax colleagues) related to cost segs in the last year or so- and of those none of DIY cost segs were allowed under audit. 

@Clive Smith I have a sample log in format that follows the IRS Audit Techniques Guides (ATGs).

My accountant wants me to start doing this in the event of an audit being I’m starting larger projects and will be implementing cost segregation Thanks

If you don't report the income, it could lead to an audit. 

However, full site visits, though more expensive, maximize tax savings by capturing every depreciable asset and offer better audit protection.While online studies may be suitable for simpler properties, full site visits are ideal for complex or high-value properties.

Investors should therefore exercise significant care when choosing their Qualified Intermediary because of the critical role the company will play in the administration of their 1031 Exchange transaction.It is extremely important to note that 1031 Exchange Qualified Intermediaries are generally not required to be licensed, regulated, audited or otherwise monitored by any regulatory body.

Whilst there were no obvious structural issues caused by the settling, the evidence was there for a trained and impartial eye to see. 

If you did the refi 3 months after, it could trigger them to audit you.

It would be smart to do a full lease audit, estoppels issued, and tenant interviews.And if you are buying cash, there is nothing mandatory, since it is your money at risk. but again, physical condition inspections, understanding of tenants (they are a great source of information about issues with the property that the landlord may not know or may not disclose), surveys to understand accurate property lines, etc.