You must honor the existing lease terms until expiration.

Time is money and extensive knowledge in a particular field doesn't come for free.So what am I doing with existing clients with interest rates so high that want to buy NNN with long term leases and strong tenant.1.

Most places areas like this have been doing short-term rentals long before AirBNB even existed. 

Say the reason people came to the area didn't exist anymore.Say everyone came to a theme park and that park closed.

I'm all about peace of mind and if it doesn't bring peace it has to go! 

@Chris Martin Happy to connect you with my contact at Velur to learn more but they identify parcels adjacent to existing solar development (or residential, warehousing... different zoning options for diversification) and do the analysis on value, easements, zoning viability for development etc...they take their cut up front in the sale then when you get an offer for purchase down the road they help review the offer as well.

Where the letters aren’t outright fraudulent and lies, they are misleading, with the person selling or giving the proof of funds letter to the unqualified wholesaler doing zero due diligence on the property and at best stating that, technically, funds could exist and or be set aside for the purchase of the property,The practice, when used this way is meant to mislead, and those who ask for, give out, or receive, proof of funds letters in this way are not welcome here on BiggerPockets.The right answer here is to qualify for a loan on the property personally, and show this to a seller, or to be straightforward with the seller that you are in no position to buy the property personally, but will be wholesaling it for them. 

I am familiar with both upset and judicial tax sales in PA, where the former is subject to all pre-existing liens, and the latter generally wipes most if not all out. 

Plus, many cities in The Valley are exploring allowing ADUs to be built on existing properties that meet specific lot requirements.

This is a very broad question but to give a general answer, the reason why they exist is to finance properties that won't fit the typical bank credit box.