Lots of little houses on large lots, some with multiple units (can be cash cows) built before permits were required so grandfathered-in.

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. 

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.

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

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.

This strategy can generate quick profits but requires a good understanding of renovation costs and market trends.House Hacking:Live in one unit of a multi-unit property while renting out the others.