Based on the CU's loan calculator, we can finance that over 60 months for a $320 payment. 

Do you have a price range (or down payment target) and are you ok with some rehab or do you prefer turn key?

Your payments are known. 

Then if/when another good deal comes up, you can approach a lender and look at leveraging either of the properties in order to fund the down payment of the new property.

Where are your fixed rate notes at and their respective monthly PITIA payments ?

You could get most of your down payment back, or be able to pay off investors quickly.  

If the business sells (it’s currently listed), the rent payments would stop, but I’d still own the property as an asset.

Make that rent payment out to you and pick up a roommate.

Other lenders will specify a maximum LTV.Payment Options: If you allow payment deferral, note it here.

One has no mortgage, their other has a HELOC for around $20k remaining and is coming to its 10year term that was established before placing with LLC.My predicament is how/best way to pull equity out of either property for a down payment for the 3 family that is valued around $450k.