@Dimitris KontonikolasThis doesn’t sound code compliant.  

We buy the Schlage electronic code deadbolt/handle combo.

You could check out www.datausa.io and type in the city name or zip code.

I have a good relationship with the code enforcement officer in the city, so he joined me for the tour. 

Look into your state or local property code about what you can do about a slum lord.

If these are in mint condition... the electrical will no longer meet code, and I recommend re-wiring.The plumbing is a toss up, sometimes we scope lines and they are clean as a whistle; sometimes we scope lines and a 4" pipe has an effective inner diameter of 1/4"... just depends. 

But there might also be a good reason for it that they can explain.Some other things that might apply to your deal as you head towards closing:- Typically there's some kind of review of the preliminary title report (to show any encroachments, liens on the property that will be paid off by escrow at closing, any covenants/codes/restrictions that are recorded on the property, etc.)

This may be a code violation issue.

The detainer filing will cause a snowball of grief on them and unless they can prove to a judges satisfaction that they have rights to adverse possession, they may be arrested for criminal trespassing (penal code 602 PC) as they are removed. 

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