Your most expensive areas will most likely be ADA/Handicap access, Fire safety/prevention, and electrical (is this aluminum wiring and are the panels Federal Pacific?).  

A couple recommendations:  Our company policy is to pull the ad as soon as we get the FIRST applicant that meets our criteria.

There is nothing you can do about it.As for Fair Housing, my tenant’s neighbor will be protected by ADA - she has the right to move in her own house on wheelchair even after 11pm if she needs to.

One of our homes will become a rental/Airbnb property and the second home that we are currently building will be our main residence and have an ADA-inspired in-law suite for my parents.  

Then, with your next investment property, ad a new "Class" for that property.  

The lead was for a 12 space trailer park in Ada county idaho.

These will be less expensive options but be aware that the municipality might be asking for more.If the municipality is asking for zoning issues, ADA requirements, historical items or design changes, etc. then get an Architect.

I'd ad a nice striking chandelier ( not white) with multiple bulbs new table, similar to what's there now. 

However, if you really like this house, you can use the wrong ad as an leverage to negotiate to lower the purchase price.

@Jesse Waters I am NOT an attorney but have had experience with ada and other protected classes.