Dan's right about this one. Unfortunately, you will need to consult with a qualified tax professional, CFP, CPA, tax attorney or EA/Tax preparer about this matter. However, if you want to learn more about what steps will be taken to determine the amount of "forgiveness" money that may be excluded from your gross income, the form that will be filled out is Form 982, which you can see here at http://www.irs.gov/pub/irs-pdf/f982.pdf.
According to what I've read, the exclusion appears to apply only to principal residences. Since this was a triplex (investment property) and not a single family home, this property may not qualify under the current "forgiveness" programs that will be in place for homes sold short, foreclosed, or relinquished under deed-in-lieu from 2006 through 2013. Again, however, your tax professional will know better how to resolve this matter in your best interests!
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