It won't be 100% accurate, but it will be close enough.

How can I accurately calculate NOI when the experts can't seem to agree on the fundamentals?

So it’s a little gamble that’s taking here as it cost extra as 700 per month around 8.4K per year from my pocket .

By the way, if that rate was accurate, investors, including myself, would have bought the whole town by now.

Greg had good advice about ensuring the trust and escrow books are accurate as well. 

Would definitely consult with a licensed general contractor in your area for accurate information 

I believe there are less than 1,000 people in this country who earn more than $100K in profit wholesaling over the last two years, and even that's hard to accurately pinpoint, because most wholesalers, excluding the folks who sell expensive courses, tend to have larger holistic real estate businesses, that include flipping, hold, private lending, turnkey rental sales, construction, and other related businesses. 

I make about ~$60-75K/year (bonus dependent) as a market research analyst focused primarily on the regulated US online gambling industry. 

Your numbers need to be pretty accurate to be successful.

The property would be a good addition to my portfolio but I am not sure how to accurately estimate the value due to the poor record keeping by the owner.