I already have 2 loans on the property with great interest rates that I'm not looking to replace.

.✅ Denver - April - $610,200✅ Westminster - April - $570,000✅ Arvada - June - $655,000✅ Thornton - June - $560,000✅ Lakewood - June - $605,000✅ Englewood - July - $600,000✅ Morrison - June - $968,000✅ Conifer - January - $872,500✅ Evergreen - April - $1,200,000✅ Golden - May - $1,025,000✅ Littleton - April - $680,500✅ Parker - July - $715,000Certainly these months/time frames can change in 2025 depending on mortgage rates, inventory in your city, etc.But, if all remained constant, this gives you a ballpark idea of time of year to net the most money

They have had 100% occupancy at market rates and currently bring in around $2,000 per month in cash flow.

Reason is a Heloc generally carries a higher rate on a shorter term and "Can Never" be used as an "Asset, or for PITI reserves" which are both required when you buy an investment property. 

My best guess is their failure rate is more than 98%.The truth is not as “convenient”.

My first mortgage was almost 11% and that was a good rate.

While I have a fantastic rate, the co-owner's giving me the option to refinance or he'll force a sale.

With current interest rates, and they are at least 1% higher with potentially additional points for non owner occupied property, it is hard to find properties that will allow for positive cash flow after paying the mortgage, if you are looking for money for the down payment from a private lender, those are normally at higher than market and I am not sure it would be possible to pay it off.... please remember you need to take into account that you may not have a tenant for a certain amount of time, a tenant may stop paying rent, or you will have a big ticket item to fix, so I would wait if I were you and save to have enough for the down payment and closing costs and perhaps some money set aside for repairs. you also want to make sure that you have your own emergency fund outside of the money needed for the investment property because life happens ....

I think most investors want to win on more than just the interest rate.

Good occupancy and solid CAP rate.