One thing I didn't see in your analysis is reinvesting the monthly proceeds from the note, the miracle of compound interestIf you simply compound the interest you would have $775,198,17 after 15 years.  

The order covers all evictions other than those related to tenant actions that imminently threaten the health or safety of others.González intends to introduce legislation Monday that would allow tenants to use the pandemic as a defense in eviction court.

4) I would have to think the 1031 is a compounding benefit.

If the property has mortgage against it, the landlord could not have acquired that property without buying insurance and if the landlord stop paying the insurance (Assuming it is not compounded) the insurance company usually notify the note holder / mortgage company.

It really is all about proper research and creating as many defensible systems to mitigate as much risk as possible.

Most liens are simple interest and do not compound.

Hard money loans, variable interest rates, etc. all can create time pressure that might compound, creating more and more stress on your business and life over the next few years. 

The beauty of the liability policy is that is will also pay all defense costs, which can get very costly, so best to put that expense on the insurance company.

If the property returns 10% Cash on cash return another $10,000                                          total of $12,000 on that $100,000 cash investment with the compounding effect in future years to magnify that with no opportunity cost Investment Account- If you sell an investment earning 10% a year to fund the down payment you still earn the COC return of $10,000 if the property                                            preforms, your opportunity cost is then the 10% you lose in control of the investment account or $10,000.

I'm actually a financial anaylst for a defense contractor and I realized its time to make a change.