We bought a home in one of the nicer zip codes in our city, in the top school district at what we thought was a deal.

You can also make complaints about state employees who violate federal laws to federal officials, but you need to be specific as to what federal law or code is being violated. 

I assume the rental props must be in compliance with the city code, but what they are exactly?  

In addition do that during the renovation I am able to link a smart lock to the system to manage who is coming and going from the site by giving them a code to access the house and when they are done I can delete code and rearm the alarm, all from my office.  

It was then redone with PEX pipe because you can color code.

Are there certain zip codes I should stay away from?

It isn't that it's a legal non-conforming, but it is non-legal altogether, and he listed it as a multi-unit for sale.That's a violation of the RE code in every state. 

I give fedex, ups the code and they drop the packages in the hallway.  

My concern is about finding something that is to code eg Romex for say 18ga.

Question: Is their a resource that has data on Rent Rates and absorption rates within a specific zip code??