Revolving rates are important.

Personally, my investment goals revolve around cash flow so, although my properties locally now cash flow, I lost a lot of potential out of state cash flow generation with the capital I put in to them and the negative cash flow I experienced in the passed.  

What I would do if I were in your shoes is do a HELOC for as much as the bank would give me since it is a revolving line and excellent way to grow your business.

Cam

I like to think of it as a revolving credit facility where I am the bank and I don't have to rely on an external credit committee and the associated red tape to draw from the facility

There can be a lot of reasons why a credit score is low, and lack of revolving credit/debt can be among them.  

Currently, I have a triple net lease so I am paying the CAM/taxes on the entire property since the billboard is listed as a temporary structure.

I did take out a 3 secured CD's to keep my credit revolving and increase my score in case I wanted to leverage. 

@Alan HallProperty taxes on multi family ( 2 or more doors ) are at a commercial rateIt doesn't seem like a lot but in my areas of investment as I stated above it just makes multi not as attractive.Tenant wise, one side of my duplex has had the same tenant 3 plus years and the other side has been a revolving door.

There are a hundred other reasons that you cam reject an applicant.