My local authorities allow STR once I get the necessary permits and business licenses.

Building plans are generally owned by their author/architect/engineer.

One of the most important aspects of wholesaling is determining that the seller has the authority to sell the property.

., in favor of any governmental body, authority or agency.

If multiple neighbors contact the property owner or local authorities, it might increase the pressure to resolve these issues.

Does your local housing authority allow this type of arrangement? 

My challenge is that I am not authorized/signed up with the city to take on CHA checks, so that will take a while to get a tenant.

A closing / title company can handle the transaction but may want to get a lawyer to draft the documents.Assuming you are buying in your name and not a LLC - if a LLC then there would need to be additional docs like a authorization for LLC to borrow $ etc

What authority under the Trust does your father have to sell the property? 

Tenants should have no authority to engage contractors without authorisation from the landlord and if they do they should never be compensated by the landlord.