A 7.0 releases some 32 times the amount of energy as the atomic bomb used on Hiroshima. https://www.omnicalculator.com/other/earthquakeI am fully aware and well versed. 

But it's rapid price growth and sales activity could indicate a more volatile market, with the potential for corrections if demand slows as affordability becomes an issue.

I have a potential deal on the hook however, the property has been neglected by its previous and current owners and the current tenant isn't the cleanest.

Detroit offers solid cash flow potential, a relatively low barrier to entry, and the market fundamentals are improving with a growing population and significant investments in the city.Since you’re based in upstate NY, Detroit is also a quick and easy flight, making it easier to visit and get a feel for the market if you’re considering out-of-state investing.

multifamily and single family both have potential value.

A second STR in a market with year-round cash flow potential might balance out your portfolio and give you more consistent income.

I know pools are a must have amenity to compete in many markets and I have to admit that I'm a bit hesitant to enter those markets due to the potential liability risk.

In terms of maintenance, they are generally safer because you are not responsible for the exterior and common areas and potential leaks, etc.

Using these parts of local zoning can lead to potential deals.  

So, they could potentially buy another house later on.