MIC_KY_MOUSES;
I will have to defer to your tax advisor. Our 'second home' is actually a 37 foot yacht, in which we have a small mortgage. We don't rent it out, but the mortgage interest outways DVC's so we use the boat's interest as our second home. The IRS tax code does allow boats to be considered homes, as long as they have a bed, stove, and toilet.
I would encourage you to check out though, as it is a very good question. On face value I would probably answer yes to your question as the way I read the IRS publication, the language seems to focus on disqualifying mortgage interest if your second home has a mortgage, and then capping the amounts to $1,000,000 in face for the mortgage, and $100,000 for the home equity loan. Conceivably, you could say DVC is your second home (it has the mortgage), and the other home is a a rental (with no mortgage). Of course the rental property gets itemized on a seperate schedule on your 1040 form. (I also assume you never use the property yourself, as it is rented full time).
What is also interesting in the IRS language is the way it disqualifies mortgage interest deductions for third and fourth homes, but not their real estate taxes. I do deduct the real estate taxes on my home, boat, automobiles and DVC. The Peoples Republic of CT does not allow any deductions on mortgage interest on any property, and will only allow you to deduct real estate taxes if you file a tax return in that state where the property is located. Needless to say, I don't file in FLA, so no deduction for DVC's real estate tax for me on my CT tax return.
In any case, check with a CPA or other tax professional, which I am not.