I thought it would be a good topic to discuss and was just curious if it's common Nationwide.

In a real estate borrowing context it's most commonly used in construction and bridge debt originated by banks.  

It was common to buy land for 10-20% of what it had been selling for just a year prior, sometimes even less.

A good network will help you fine-tune your approach and avoid common pitfalls.Hope this gives you a solid foundation to get started!

Acting like a broker dealer is scarily common.

This was very common in 2008-2011 when values declined

You can get all the advice and guidance with the forms you need from a local Realtor who has worked on hundreds of Real Estate transactions that have common forms that everyone understands and pay a $250-600. 

Think Euro, but instead of common trade and societal alignment, instead common trade of resource, international resource, and alignment in such.

A very specific and common mistake that AirDNA makes is that many STR operators don't allow back to back bookings so for each real booking it will include a day on either end of the booking which it includes in it's revenue determination.I believe Cliff on his experience with overly optimistic projections. 

The concern from the secondary capital markets lies in the following: Residential assets are appraised as, and commonly zoned as, their highest and best use.