So that window opportunity is closed.I would rather pay tax and live happy in the younger days, there're just still so many opps to live happy without thinking not to die LOL You aren't supposed to borrow every year....and there are DSCR loans that don't require W2 income to qualify for loans.

And if so, what is the cost and prospect for collecting something, certainly not all, but something.My thinking is that if it shows up on their credit, it may hamper employment, car purchases, rental applications, education funding, etc and at some point they would need to pay me to go forward with some major life steps over the next 10 years.Your time and money would be better spent updating your rent requirements to get better tenants, increasing deposits if allowed and proactively evicting tenants who are behind so you don't get back in a position where someone owes you a substantial amount of back rent. 

Is this something the court can require AirBnB or VRBO to disclose, past rental records? 

In your case, the city will require a fault trench study to determine the precise location of the fault line.

The in-laws want simplicity since they have no interest in managing the unit.From what I understand, it seems logical for them to handle the required taxes (TAT & GET) and compensate me via a 1099 form.

However, in many cases you likely won't be able to obtain by-laws until you are under contract.I would have your attorney include a specific "HOA" rider in the contract for this exact reason- It basically would require that you have ample time to review the governing docs of the HOA, such as master deed, current by-laws, current year’s budget, and last two years of audited financial statements, association meeting minutes, etc. 

Looks like they require a license per rental from the city.

Most wholesalers require no-refundable "earnest money" so in the event the buyer backs out of the contract, you are not at a loss. 

The state wants a separation as a step to divorce and if a partner lived away from home how does that requirement work?

Including, but not limited to:- market- capital required to renovate the four units that need renovation- expected operating expensesFeel free to provide here or message directly.