You would treat it as "tenants in common".

it is somewhat common for properties in our area to touch, since they are built over 100 years ago chances are it is an existing easement if it is on your property and there is nothing you can do about it

Is it common to have a property appraised and inspected following a seller - financed agreement?

It usually looks like one single large apartment complex composed of 4 -unit buildings that is gated, shares parking, common areas, and sometimes has a pool.Here is an example.http://www.realtor.com/realestateandhomes-detail/2833-E-le-Marche-Ave_Phoenix_AZ_85032_M22535-23255Notice that the HOA fees are $7740/year, or $645/month.

I'd like to copy and paste all listings with sale price, features, and common rental rates to come out with potential ROIs. 

The entire floor in the kitchen is rotted away do to the roof being in such bad shape it leaked causing the floor joist and sub-flooring below to totally disappear, this is also common in 2 other areas of the house.

My day job is in MBA career services, and when I meet with our alumni, they commonly say that their soft skills classes (OB, Interpersonal Dynamics, etc) have been most helpful for them as growing leaders in their organizations.

All the ideas above are excellent, especially the calls for a "mini start up"...but I'm surprised to hear such a push for stocks.While investing in stocks in certainly a very common way to get people involved in investment, I'd argue that stocks are very easy to "tune out" rather than actively learn from.

(Regardless of the actual amounts, the concept is the same).(6% is a common cap set by the lender for seller concessions, but I'm not sure how that applies to the numbers you provided)Seller concessions to pay for buyer closing costs are very common.

Pretty common.