Before stepping into this industry, I worked in Hospitality for well over a decade as a managing partner in a bar which my partners and I chose to sell in 2014 which ended a 3-year run.

Regarding #3, you probably are not going to like the US bank financing you'd qualify for as a non-citizen, but there are many other lending options worth considering.For over a decade, I've worked with international investors building a rental portfolio here in the States.

She has kids, a husband, etc - how rude would it be for me to walk into her business after not seeing her for a decade and demand a discount. 

I prefer to ask my local lawyer who specializes in landlord/tenant law and has leases that they used for decades on thousands of cases and they have been changed and massaged for local rules.

Self induced - because it was artificially suppressed interest rates of 2005ish that created the housing bubble and the past decade that created the current one.

They live in Falmouth full time and have been turning over STRs down there for over a decade.

We were fortunate enough to get into it a few decades ago.

Many of them were completely legal for decades and have since become non-compliant because the requirements for units have become more strict over time.  

We are in process of acquiring a 125 pad park, that was mismanaged for about 2 decades.

I think we've replaced 3 refrigerators in the last decade and they were probably legacy ones (came with the property).