Most people will not want to spend time on a deal or partnership if the numbers are too tight.Your other value here is:- You have full access to the property.

I was told that homeless/squatters got access into the building somehow and they were seen by an agent who was touring property for their buyer.

Now a historical area on the other hand, with restrictions... this makes me look at what I will have to do and the extra steps I would have to take to do it. 

Opportunity Zone InvestmentsAn Opportunity Zone are areas that struggle with poverty and lack the necessary access to economic opportunities.

To me the quadplex would be dual purpose, while you are not living there it serves as a reliable stream of income, once you move there, you could live in 1 of the units while you build your permanent home, and you could also use it for when your family comes over for large gatherings.A 2nd option might be to build an RV park, Unless their are zoning restrictions, you should be able to build one fairly inexpensive, with a septic system and either public water or a well, you can keep your costs to a minimum by doing gravel roads, which are easier to remove later if you don't want them. 

Most locations you have to pay to get online access to all of the property records or you can go to the court house to access them in person for free.

The local markets depending on where are talking about or have put in restrictions on STR's.

I finally got the deed and accessed the house.

@John Mason yes, but I am sure some of the condo associations probably do not allow them or there are other restrictions.

Its great to have access to the cards/cash but to me that is only if doing a flip or BRRR.