Personally, If I could pull out a HELOC, I would use it to fix and flip which will typically make sense as you shouldnt be keeping the money out for that long and you can recycle it or pay it back and build off the capital that you got from. the flip.

@Chan Park Hi Chan, I sense you are fairly new being a landlord.  

I have a duplex under contract to sell.

@Asher M.Possible, yes but like your lender pointed out it's going to be difficult to pass the self-sufficiency test (SST) for a legal 3-4 unit property.

I am a buy and hold investor.

Quote from @William Fuller: When deciding to potentially acquire a piece of land that a wholesaler has under contract, what information do you need about the land or parcel?

I look forward to meeting new people from different backgrounds.All the best,ThobyDelaLuna

Once you complete and rent/stabilize, you should easily be able to get into a DSCR loan.

Quote from @Rich O'Brien: Talk to a lender immediately!

Sell our house (~$700k) and purchase a new one in the Seattle area.