Use cash reserve or HELOC

[Changqin X.]

I plan to buy more properties, what financial resource would be best to choose?

I have 3 options:

1. Use fund that is currently in stocks/bond.

2. Cash out refinance— I just did non cash out refinance on one rental property, mortgage rate was 3.0 which is not bad.

3. HELOC from the rental property since there is 50+% equity in it.

From investment perspective — Should I use my own money, cash out refinance, or HELOC, to buy more properties?