Taking out home loan for investment property?

[Jack T.]

I'm buying an 14 unit apartment complex and in my past real estate purchases, I've used a HELOC for the loan portion, which I do deduct on my tax return. Can I do the same process, except take a 30 year mortgage out on my (paid off) home to finance the loan portion of the apartment? And still deduct it on the real estate portion of my tax return? Cheaper rate and longer term this way.