A HELOC could help temporarily if you plan to payoff the balance quickly and are planning to save on monthly payments in the short term.  

Interest payments hit my account as expected.

We were discussing options for payment as we don’t have a lot of capital at the moment, however they have a property that has a bit of equity we could tap into, but they already have a favorable interest rate.

This has to do mainly with the timing of property tax payments for your own home (not for your investment properties) and your charitable donations.

Or like your plan use it all as a down payment on a much larger property.  4.

How much are you short for the down payment?

Think about it, if you are buying something at a 5% cap rate, but interest rates are 6%, the debt payment exceeds the income.

Properties will find buyers at any competitive monthly payment.  

What is the repayment schedule (monthly interest-only, balloon payment, etc.)?

I mainly want a site that offers advertising the property, online payment options, maintenance requests & at least a basic accounting aspect.Thank you in advance!