After digging it out the plumber determined that the pipe was busted and had cement leak from setting the fence post into it causing the back up.

That risk is spread when you have a portfolio of properties or you have deep enough pockets to absorb the occasional cement filled plumbing lines and missing copper that you might find in an auction property.  

Breaking out cement for new plumbing in bathroom.Septic system installation.New driveway going in.New concrete pads being installed.

Kitchen and rest rooms and live in ready.Second property:$152,000 asking back on market, 40 days on market1,600 sqft19602 bedrooms 1 full bathroomThey did a cheap flip on the house (has new floor and paint), has foundation issues, the high schoo is next to the house so major traffic area, kitchen is not live in ready, no space for the fridge, need to change the wiring for washer and dryer since it's in the kitchen, the front and back door cement steps need to be torn down. 

We also redid the cement in the backyard and added walkways, new sod, new water heater, new garage, new windows and doors, LED recessed lighting throughout, new carpet, drywalled the garage and epoxy'd the garage floor, and as an added bonus to the homeowners; purchased a brand new samsung washing machine and dryer.Purchase price: $510kRehab: $115k (Includes labor, finishes, taxes, insurance, utilities, etc...)Commissions: 2.5% = $18,750Sold for $750kProfit: $106,250BEFOREAFTERWe added the subway tile after a couple days because they weren't installed yet during the professional pictures.

. :)A lot of houses around here have old clay pipes that were cemented together 100 years ago.

I was leaning towards getting it, but you have cemented the deal.

Just ensure it is inspected like you would have a cement foundation inspected.Are you sure about the market price of $185K for that area?  

Also, The properties I'm targeting I've spent the time upfront cross checking town / state tax records to further cement the fact that these are the right properties to target ( behind on taxes, water and sewer liens etc. ) clearly, these people are financially stressed.

I would go with cement, epoxy or laminate flooring; material and labor will be much less than any kind of tile.