The answer might be too tear down the existing structure and the cost to do so versus existing use and structure with a restoration. 

Therefore a slow leak that could have been repaired easily just turned into expensive water damage, mold, restoration work, vacancy, etc. and good luck getting the tenant to pay for all that even if it is their fault and no matter what your lease says.

Hiring a certified mold restoration company (can be $$) sometimes is needed as some buyers want the assurance that the mold was remediated properly.

Update : Discovery / HGTV bought the house and will be restoring it to 1970s style “HGTV will restore the 2,500-square-foot, two-story home, which backs up to the L.A.

I called the PM he said he would look into the company and I would not have to pay the fee...ok cool hope is restored in them. 

I reckon the best ethical compromise is to buy a quadplex; live in one and rent out the rest! Or

Enjoy the rest or your days and thanks for any input!

You could respond that you could have charged for the complete restoration.

I would suggest restore on forest park parkway or west co off manchester. 

Not sure how things are out there but I️ would only assume that if you restored it right in a historical fashion and marketed the property to a wealthy buyer who appreciates historic homes then possibly could have a massive deal.