This is not the first time I have heard of issues of this nature as many of the investment clubs I am in are seeing GP's stopping the issuance of dividends and performing cash calls.Lastly, if you are a single family investor and thinking - who cares this is commercial, recognize commercial real estate has a significant impact on residential real estate since it will lead to banks being more strict on lending and a drop in rental rates on MF will make its way to residential. 

We've contacted the neighbor and he's agreed to draw up an easement to resolve the issue.

I am sure that you would think that the Turo contract would help with that, but seeing as you are providing it as a service in addition to your STR, I can see issues if there is a problem.Plus you are offering significant services with that rental and that would change your tax situation.

Will permits or zoning be a major issue and etc.

I currently have an upstairs common area with 3 walls, and I am interested to convert that into a bedroom.

The only benefit I would say is what they end up paying for not cleaning the poop in the common areas/yards, which is an extra $200 to $300.

Also, I only take care of the inside of the unit so very little issues there, so less expense.My SFR's are different in that I need to have some money to address major issues, like Roof repairs, painting (inside and out), etc. 

I agree with @Nathan Gesner that the migrant issue is fueling the fire on the affordable housing crisis, more people needing them has to drive scarcity. 

What I often see being a mistake is people ordering a cost segregation study before speaking with their accountant to see if it would benefit them on their return.What a cost segregation study does is analyze a property further to identify assets that be classified with a shorter asset life than 27.5 or 39 years.The issue when getting an 'estimate' from a cost segregation study company is that they are not accountants(more specifically not your accountant).

One of the tenants has been causing issues with other tenants.