I think I want to trade up and do a 1031 exchange for a Multi-Family property, but not sure if that is a better strategy than just taking the money out through a Cash Out Refi (or a HELOC) to buy another one or two SFHs or MFH.

Should I do:*HELOC*Personal Line of Credit*Business CreditI am stuck because each of these would hit my credit very hard and I am nervous that it will drop it too much to be in position to refinance.

Should I do:*HELOC*Personal Line of Credit*Business CreditI am stuck because each of these would hit my credit very hard and I am nervous that it will drop it too much to be in position to refinance.

Would i be qualify of getting a sba economic injury disaster loan(3.7%) to pay up heloc loan(4.7%)?

Issue you may run into is trying to finance a 65k house.You'll likely need a private lender or a personal HELOC as most banks won't get out of bed for that.

Since I have a mortgage on one of the houses mentioned above as well as a HELOC on my primary residence (I used this to pay cash for the fixer upper that is currently listed for sale), what would be the good way(s) to get another mortgage for the third investment homes? 

maybe just get a HELOC since you have 100% equity

I am considering doing a REFI on my primary residence to get access to a 100K HELOC.

Planning on taking a HELOC once I have more equity built up so I can fund more deals.

HELOC's should only be used if they're going to be paid back within a 12-month period because of the interest only payment.