Simple solution: Inform them that unfortunately you can’t accept ESA letters without being able to verify the validity of the letter by speaking with the local licensed mental health professional who prescribed them their ESA, so that you can verify that they have a legitimate disability requiring an ESA as well as that whoever prescribed it to them is a real licensed mental health professional who has an ongoing relationship with them beyond just receiving a one-time payment to “prescribe” the ESA. 

We tried setting up a dev call several times to determine if they needed anything more from us.

I’d consider what your actual damages  are, if they are easily quantified and can be proven to be caused by the non-disclosed issues, and then use that to determine if it will be worth taking up a fight.

They have successfully overruled the two most powerful maxims most investors use to determine what to invest in: 1) location, location, location and 2) the ROI. 

I can't say for sure if the BP calculator offers such a calculation as your tax situation impacts how the depreciation will effect your return.By bonus depreciation I'm assuming you're referring to doing a cost segregation, if this is the case you'll definitely want to review your tax return to determine if you can even take advantage of a cost segregation.

And under that definition, because there was no minimum time in the CZO for how long someone needed to occupy a structure to be considered "living" there, the court used literal dictionary definitions (standard practice in NH as can be seen in the similar case Working Stiff Partners v City of Portsmouth) to determine what constituted "living as a household" as it concerns STRs.The court explicity rejected the idea that this ruling should have larger implications for STRs around the state, and it certainly did not at all in any way prevent municipalities from regulating STRs.

This will determine the available rate and leverage that a borrower can get. • Does the borrower have cash reserves, or do I need to use a program that gives credit for the cash-out funds towards the reserve requirement?

I am a contractor by trade and understand the costs/processes to build, but I am lacking in how to determine a proper sale price with little data. 

Check the rental laws in the state to determine the notice period. 

With $80,000, you have an abundance of options to consider as potential asset classes in real estate investing, so at this point I recommend trying to determine your ROI expectations AND your risk tolerance for this $80,000.