We also have a 4.5% interest rate and a credit score of about 750. 

I would suggest you go and talk to a local credit union or bank.

I am having a challenge finding a small bank or credit union to pull cash out of SFR investment properties which I own free & clear.

So all of a sudden you have a decline in collected rents, your cash-flow sails out the window, you're paying 18% on credit card debt, and with lower equity you literally can't afford to sell the property because you can't afford the debt payoff and the realtor commission, closing costs, etc.  

Does everyone use that and can it be applied in any area? 

Line of credit?

An option must be for a stated period of time, try 99 years, lol.The issue isn't at the state level, it's federal and with the IRS, as well as CFPB then financing if you apply payments to any purchase price. 

Typically assessors reevaluate properties every few years, and then just apply some percentage adjustment in between.

With that being said it looks like I have a terrible income to debt ratio. also a credit score of about 620. 

We bought the house for cash for about 20k under appraisal and then decided to redo the original 1893 portion of the house ourselves and then we got a line of credit for the renovation.