Maybe tell them that their real estate agent and the house inspector should chip in, since they all made money off the deal lol.

You can back out and get your earnest money back if your inspector tells you to run or your financing does not come through.

Plumbing should be easy as well, considering the inspector should be able to see vent stacks and also see proper traps and pipe sizes... 

I've met with an inspector with the Buildings department and he affirmed that the lot could be divided. 

I felt a lot of trust with my inspector and valued his opinion when making my decision to go through with it if I could put in the sweat equity. $205k building, and with a 3.5% fha loan, owner occupied, and in a low to moderate income area, with lender credits, I only put down $4,500 with less than $1,800 in upfront costs, inspection, appraisal.

For example, you may want to have a roofing inspector give you an estimate (if not already) for a more accurate budget or periodically check on the furnaces/coolers to more accurately anticipate that expense.

Perhaps a nice 1950's built bungalow.Always hire a 3rd party property inspector to give you an unbiased feel for the home.

I need a contractor/inspector to go out today to check it out and make sure there aren't any big ticket issues such as foundation issues before I pull the trigger.

Now it seems unlikely that an inspector would be able to tell if it is just a regular residential property.

I've heard that city inspectors are all over down there.