that would be usury in Oregon.. careful to check Oregon law before you launch into this one.. loans under 50k are highly regulated has to do with loan sharking..   

I just don't want to overpay an aftermarket tank just for a very modest rental income.

Too many sharks out to eat little minnows. 

I assure you there are sharks looking for chum; and YES, vet those sponsors. 

You don't have to deal with a basement with 4 feet of water with water tanks floating around in one of your apartment buildings while you are in Iceland (ask me how I know!)

@John Barrett Learning is probably the most important aspect of this to me (besides not absolutely tanking a first deal).

A Hybrid contract of sale... a way to close more transactions by joint venture A commercial contract of sale, 3 pages with special buyer requirements related to environmental conditions, existing suppliers, surveys, buried oil tanks and other conditions that must be known to make a profitable and safe transaction An option agreementAn informational pocket pack with 52 options to financing and control a building without conventional financingBlank checks, pens, carbon paper, A list of referencesDisclosures for lead paint and other state or federal requirementsCell phone with camera to take pictures of the nice things and negative aspects of the property and to take a picture of the contract to email confirmation to seller and to your title company or lenderA gift, something for the seller to remember you by, I give Indian Head Nickels away, pens, note pads.Blank addendum forms - these are used to attach to your purchase agreements (you don't want a lot of chicken scratching on your contracts; use them to write some of the following; 1.

. $100 sq to extend it, or can apply for a well with a tank that could be used in case of fire emergency.

Now, the local stocks tanked 10% in two days.

If you can do that after 3 days without water, I can only imagine what you're able to do on a full tank.