@Brian Kwan I used HELOC as down payment to purchase my duplex. I had $25k cash sitting around, but I decided not to use it since that's my emergency fund (personal money).
Using HELOC fully to fund my down payment allows me to keep the books "separate". - so I can see how my investment is doing.
In your first post, you said you will have to pay $250/month, if you use $60k HELOC. Are you sure about this? As far as I know, most HELOC's requires 1% payment every month ~ $600/month in your case.
To be honest, after I pulled $80k HELOC and tried to pay it back. It's not easy. All of the reserves money for (capex, etc), I put it all in HELOC because I am trying to minimize the interest. - if I ever have to spend money on capex, or roof..in the next 1-2 years. I will definitely pull it out from HELOC again. Otherwise, I will take my chances and hope for the best.
My Heloc is almost done. $20k left to pay (in credit card with 0% interest). After this, I can start accumulating my reserves.
I also put all my cash flow income to pay the HELOC down. every penny goes into it.
My strategy to minimize the interest is to open a Balance Transfer credit cards with 0% interest and $0 fee. I opened 3 of these between me and my wife and transfer my HELOC to those cards.
Yes, it dinged my credit score pretty hard (went from Excellent to Poor in a like a week LOL). but for the last 15 months. I paid $0 interest. (saved about $5k in interest at least).
All my HELOC payments in the last 15 months went to Principal. Now my credit score is back up to the "very good" ratings.
Anyhow, just giving you ideas. I am not suggesting at all.
Good luck!