I guess this is more for those who look for some brain exercise as it is a bit complicated case. :)I'm looking to buy a land which is undivided common property and has 15 different owners (most of whom have equal share of the ownership and owning their part for approximately 20 years).

Keyfobs is the best way to go plus can remove access to some amenities if fail to pay dues, say the exercise room, the laundry room, pool, etc.

2) Appreciation: your management team will exercise the value add component & spruce up the units on natural turnover.

There is however a duty on the Assignor to disclose to the Landlord/Optionor/Seller if there is any monetary valued the the Assignor is receiving from the Assignee and the Landlord/Optionor/Seller has to approve the assignment regardless if their is any monetary compensation between the Assignor and Assignee.Typically we do not utilize an escrow company in a Lease Option Agreement unless and until the Option is exercised by the Optionee. 

This would be a good starting point.I found it a helpful exercise for me and one you can always re run on a quarter or annual basis and you'll always be able to identify the low hanging fruit in terms of cash flow markets. 

I've heard from several investors that banks virtually never exercise this clause and demand full payment. 

If the bank finds out, they can exercise the "Due on Sale" clause and foreclose.

When dogs are not properly exercised, the will often result to destructive behavior.

The point of this as an exercise is a little different though.

If the bank does exercise the DOS (which is very rare) they have to give you time to sell, refinance or correct the situation.