@Olga K.It doesn’t necessarily confirm the sewer line is completely blocked—it might just be an issue with the internal plumbing or fixtures.

The issue you will have is that finding out what a property actually rented for is difficult.

The enforcing agency certainly cannot take action against an unpermitted unit without citing a specific health and safety issue to address.  

Unfortuantely, things happen that are out of your control.The insurance issue is such an important takeaway.

Mostly this is looking at habitability issues. 3.

It has now been 3 months that the auction has been won and the deed has still not been issued.

Let's analyze each issue you've mentioned:1) Tenancy Length: besides issues a landlord can't control, like death, sickness, job loss, etc., the actual management of the property & tenant play a large roll in how long tenants stay in their home.

But you do have to put some language in your lease  agreement or lease addendum that deals specifically with issues that will come up for the fireplace.  

There's a good chance the issue(s) you face has already been discussed and answered.Ask questions in the appropriate forum.

That has stopped but we do feel it to be a security issue.