Banks are regularly visited by federal auditors and work hard to keep in compliance with properly handling transactions.

The auditor has some info, too.As for ARV, I am looking at comps from CMAs that brokers and agents provide in addition to the websites everyone uses.Having a crew ready to work (and a lawyer, and a good title co.) seems prudent.

You can usually find this information (taxes) on your local auditor's website.

No auditor will look at every transaction, but they pick a fair number to try to find any issues, as well as review the General Ledger entries, bank reconciliation reports, etc in an attempt to find any wrong inputs, or worse, blatant fraud.

(On Maple Street only about 3 blocks long I owned 12 houses...once I bought into the street I found value and became known as a cash buyer who maintained their properties so my phone rang and I shook hands on the street to keep it ringing.)Always check ARIES the Lucas County Auditor site.

@Neil SmithPull a list from the auditor of what you're looking to call, load it into a dialer, call the numbers and ask to speak with the owner (their first name) - Introduce yourself by being personable (Who you are(first and last name - age/background), where you're from(local guy), and get straight to the point - why you want to buy and if they're interested in hearing an offer on their property - it's like a quick handshake over the phone. 

When we're getting into the weeds here, @Keith Consiglio, the real question we're untimely asking is "If a state or federal auditor looked at what I did, would this cause any headaches for me?"

If you would like to see the guidelines for IRS auditors regarding Cost Seg, you can find them starting on Page 24 of this document https://www.irs.gov/pub/irs-pdf/p5653.pdfI would be very surprised if you could claim unpaid labor in your Cost Seg. 

He is a former IRS auditor, before going out on his own.

Go to the city or county auditor or treasurers office and ask them.