So if I understand sub to, you're basically assuming the mortgage.

It will familiarize you with the basic terminology and benefits.

I essentially present to them my numbers of what I can redo the property for, and they loan me 80% of the ARV basically no questions asked except for an appraisal.

I have a basic spreadsheet built for clients that I'm happy to share for free.

I don't anticipate things to be that bad this time, but the value dropped over 25% back then and we are unsustainable at the point of the affordability cycle we are at now.You basically will be buying a monthly debt, speculating the value of the property is eventually going to go higher than you bought it for.

I did approach them about a year ago about getting $25k credit line per property, and the response I got was basically no.

Keep your equities levered at 20%(half high vol, 1/4 low vol, 1/4 basic indices) and keep your phys/hard assets levered at 40%.

Left me feeling like a basically have a retail/fulfillment person on my team so I'm a big fan and would recommend giving them a shot, especially if you're in a similar position as I was: Needing to furnish an STR quickly and cost-efficiently. 

Quote from @Francisco Solano: I suggest you ask a business attorney in your state for this basic template.

Haven't updated this post.House- basically done.