Most homes still have bars on the windows.

We have been told by people installing appliances and electricians in the past they did not really want to do many changes as the system is so funky it is a fire hazard, doubt it is up to code, and once they started working on one thing they may open up a huge can of worms.

These are readily resolved but certainly raises the bar.

All foreclosures are in public record by a document called a lis pendens, required by the Uniform Commercial Code. 

The house ended up having a newer air conditioner unit that was never permitted, $, after the fact permitting and bringing up to code. 

Things that require some form of opinion are harder (Basement drywall was installed before the requirement for mold resistant drywall, recommend removing and reinstalling with current materials to code). 

I don't cold call, I don't spend thousands on blanket mailing my entire Zip code.  

I put $550,000 into the demo and construction of this new single family home with over 2900 SF, 2 stories, 3 view decks, 4 bedrooms, 4.5 bathrooms, large chef’s kitchen with top of the line appliances, huge yard, attached 2 car garage, and built in BBQ, fridge and bar seating for 7 on the backyard patio.

I'm assuming your parent's concern is "retaliation" but I believe that would only apply if the tenants reported the house for a code violation or something similar.

Cody try looking at Zillow or Realtor.com put in the zip code for rentals and see what the rents are.