The only big issue I ran into is on of the basement walls needed extra support, I don't think a newer build would have that issue. 

To support my seller and seize a valuable opportunity, my business partner and I decided to purchase the property ourselves.

It's usually best to talk with your neighbors about your plans and get their support as one of the variance tests is that the requested relief does not cause a public health issue or alter the essential character of the neighborhood.Try googling "tests for a variance in [your state]" and talk with your local zoning department.

Let’s connect, and if there’s anything I can do to support you, just let me know!

You might be able to go this route if your lease says something to that effect.Without lease support, you can write them a letter informing them they are in violation of the terms of their lease due to the lack of proof of insurance.

As I mentioned before, one of my main reasons for switching was to get connected with Marriott Homes and Villas, so that really narrowed my options down to PMSs that support that integration.

You could start with your agent or a local agent who supports investors and could have contacts to refer to you.Lastly, you could consider negotiating with a local PM to take on a hybrid approach to management.  

Some are unhappy, most are supportive.

I had scraped and struggled along until then and I was just exhausted from the transient nature of the “gigs” I used to support myself up until that point .

Your question has been debated between BP tax experts both privately and publicly, for example here: https://www.biggerpockets.com/forums/51/topics/819991-expens...And we ended up where we started: no consensus and no clarity.There have also been court decisions that support my interpretation, even though I personally find these court decisions debatable.