When buying a primary residence, I alway ensure it is in an excellent location with the potential for appreciation. 

Sometimes the builders prefer to negotiate a seller subsidy or free upgrades as opposed to price, so they are not hurting their future appraisals.  

I think the deal has potential for sure!  

Ironically, the leak was discovered by the potential buyer's home inspector a few days later.

The home needs about 40k in renovations, but has a ton of potential.

I am about to purchase a duplex.I was informed that it had meth in it, but was cleaned and certified for good bill of health.Does the fact that it has had this issue hurt value when compared to similar duplexes in the same location that have not had the issue?

I've been running numbers on a combination of Airbnb and potential long term rentals on a house with a garage apartment. 

I have a potential deal at auction but don’t have the money or a proof of funds to even think about it.

You should do an annual inspection to check that the house is being kept up and a drive would not hurt to check the exterior. 

A potential investor would also want to review the existing agreement, assuming that one has been signed with the previous owner.Best of luck to you!