We have mudjackers here who drill 2 inch holes and pump under pressure low percentage cement/sand mix to lift the concrete back up and support it... only if the structure isn't out of level.  

My wife and I even got one with our most recent personal home purchase. we use it once when our AC kept tripping out on low pressure (maybe a $150 call) but other than that nothing.

http://www.amazon.com/Handheld-Multi-purpose-Pressurized-curtains-crevasses/dp/B00T56FK96/

Luckily I have been married to a woman that has been saving money for about 25 years so I am not under pressure even though it is retirement money.  

I'm a newbie, but I respond very negatively to subtle or obvious pressures to buy.

There are many areas that have prime homes to flip/sale or to hold but I have heard that due to ever increasing market pressures as well as some demographics swings like new construction and school ratings the ARV margins are slimming.

I always like what @Roy N. says - very wise.My question is can you gauge what the onsite person's intentions are.

Being new, I'm not sure where to start in assessing whether or not it is a good deal, so my thoughts are to figure out how much a tear down would cost, put up a craigslist ad for office space and gauge interest, look at comps.

It's just a quick gauge.

And rents are skewed by area-Atlanta is hot, (but look at the massive amount of construction going on to bring pressure on that) but I still have a  4/BR house in Dallas, GA , bought new in '09, that is still 20K underwater, and having a hard time renting it at $1200.