I have a long way to go just to scratch the surface of what knowledge some of you bring here.

If I have a large window then I count it as 2 windows.Bathroom sink and faucet: $150.Carpet: $1.80/SqFt.Replace a broken window: $150/pane.Remove an oil stain from a concrete surface: $75/stain.Repaint interior of property: $1/SqFt of living space (assuming the walls are not a dark color which might require two coats of paint).How did I obtain these costs?

Why is the seller letting go of a duplex that, on the surface, looks like it has a pretty strong cash flow?????

Also this city requires both hard surface roads (we chose concrete) and Frost free footings. 

I had a similar situation (undesirable tenants) that surfaced when doing the inspection of a duplex I'm purchasing.

If he has been living in the house for 20+ years and is a moderate to heavy smoker, there may be rooms where scrubbing, sealing and painting simply won't keep the chemicals from coming to the surface and you will end-up pulling down the drywall and hanging new.We renovated a house some years ago where the former owner had a favourite chair in one corner of the living room where she sat and smoked.  

Many on the surface don't really seem qualified I was looking for someone who's working in sales or sales experience but their resumes don't reflect it.

If this is bare ground like the map shows, this can be a "Sweet" deal if the market can take the extra storage units, or do RV/Boat/Vehicle storage if you can get away with "Rock" surface. 

So far this week, I have looked at an off market flip that on the surface has the potential to net $50,000-$60,000 in 3-4 months, a 96 unit complex that could easily produce $500,000-$750,000 after capital improvements and stabilization over a 8-9 month timeline and worked on structuring a one acre parking-lot acquisition in the heart of Downtown Tucson that has major development potential.

Sometimes buyers overlook things on a purchase because price is low and after the fact find out things cost way more than anticipated which affects overall returns as capital injections suck away cash flow.For mold or mildew there are surface and air tests.No legal advice given.