I would say about $8k average, sometimes reaching towards $20k depending on length of run and the difficulty of tie-in to the City main.I would not, as a buyer, wnat to take a chance on this..even if they are working well now, it is a ticking time bomb and a large expense.So I would wrap your head around the concept of offering a credit towards this item.

Use a Promissory Note and Mortgage or Deed of TrustIf you’re familiar with traditional mortgages, this model will sound familiar.

Reminder too that once you get more properties under your belt and begin having a bigger real estate investor portfolio your file begins to get more complicated and even a simply loan like DSCR sometimes may ask to prove other items.

If you were able to use the standard TREC lease agreement, there are many items that protect the property/landlord in there. 

I try to model his behavior and I'd recommend doing the same.

It is best to provide them with a checklist of items you are requesting.

The first line of item #1 of the note should be:Who is that.

Have you taken the previous inspection report and verified all the items are completed per the inspection report. 

My question is how much I should charge him for each of these items.

I think it's a bit speculative as the exact effects are hard to judge, particularly given how off many of the models have been.