Do you advocate actually getting an actuary to develop the estimate for substantiation of the discount or is there a much easier and less costly option to complete the calculation?

I have learned that a poor refrigerant charge can make compressors run much more often than they need to, substantially increasing electricity use.

It depends on if IRS considers you an investor or trader. they look at different factors, I pulled court cases where they looked at these:(1) the taxpayer's investment intent; (2) the nature of the income to be derived from the activity; and (3) the frequency, extent, and regularity of the taxpayer's securities transactions (Kay; Mayer; and Moller)  A taxpayer is a securities trader only when both of the following are true: (1) the taxpayer's trading activity is substantial; and (2) the taxpayer seeks to profit from short-term swings in the daily market movement, rather than to profit from the long-term holding of investments. 

@Chris Mason is a broker who contributes substantially to the local BP ecosystem, I would suggest you reach out to him and see if he can help you.As a small bit of advice, I would suggest you expand your thinking about the order at which you buy your properties and the effects they may have on your future self. 

It may be able to be removed but it also may require substantial framing to keep the integrity of the structure.

I would leave it alone, or just make early payments till the principal payment is substantial bigger than the interest payment (like 80/20 ratio) and then let it ride.If you refinance (which you can do at any time), what would you do with the cash flow?

Our net worth and passive income has grown substantially through real estate investing, so your thinking is on the right track.   

Like anything else, property values and rental rates can vary substantially, depending on what area you are talking about. 

Property shall be treated as substantially improved by the qualified opportunity fund only if, during any 30 month period beginning after the date of acquisition of such property, additions to the basis with respect to such property in the hands of the qualified opportunity fund exceed an amount equal to the adjusted basis of such property at the beginning of such 30-month period of times in the hands of the qualified opportunity fund. 

Putting that much in upwards of 60-70% which includes the loan will diminish the return substantially especially if your interest rate is sub 7-8%.