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It depends upon what you intend to use the money for.
The reason I asked is that the way the rules work now, the tax deduction for the interest follows the proceeds of the financing, so for example if you take a mortgage out on your residence, which will yield the best & lowest interest rate, and use the proceeds to pay off the building, then the tax deductions would flow to Schedule E.
If you were using the proceeds for something else, you could only deduct the interest on $100,000 of debt against your personal residence that wasn't used to improve or expand you residence.
So as long as the new yacht or plane doesn't cost more than $100,000., which is part of the mortgage securing your residence, the interest is deductible.
It would be unusual if you could get more favorable financing against your building verses your residence. So that's the answer; the best option would be a fixed rate for 15 years against your residence with proceeds reducing or eliminating the financing against your building.
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Thanks very much,