Refinance Investment Property for Down-payment in Boston, MA

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Hello BP,

I currently have a 3-family investment property and I'm looking to purchase another property using equity as down payment. 

I just closed on a Line of Credit from my investment property last week; but am now wondering if I should've done a cash-out refinance instead. I've called multiple banks but they will only offers LOC because its not a primary property! Do any banks even offer this if its an investment property? If so, is it still possible for me to apply for this giving that I just closed on a Line of Credit even though I have not pulled any funds out?