Here's a https://www.irs.gov/businesses/cost-segregation-audit-technique-guide-chapter-4-principal-elements-of-a-quality-cost-segregation-study-and-report to the IRS website noting specific items that are included in the cost segregation study report.

I learned almost all of my techniques for DD studying those memos.

Without these fundamentals there’s absolutely no way to utilize the various strategies and techniques being sold.

I recently had a strong applicant have court "unlawful detainer" records show up in their Zillow Background. 

However, these are advanced techniques that are rarely as easy as they sound, and they all come with additional risks.

If the second property you are buying is not turnkey, will require some work, and there is a clear value/range of what you can bring the property to by adding value then you can refinance to pay back the majority if not all of your HELOC (used for downpayment or to buy the property completely).You'll need to know how to analyze an after repair value of the property to figure out if that technique can work or not.

The second Helmsley “negotiating” technique was not to negotiate.  

You can simply go to the Cost Seg Audit Technique Guide.You point to ATG?

Purchasing notes at a discount to “capture” the early payoff windfallFor those willing to be more active, engage in study and education, and have the time, wealth building can be accelerated by using techniques such as1.

If you have no idea how to set up a pro forma that will answer #1, and #2 your issue may or may not be the numbers on the condo, it may be your analyzing technique.