There are lots of people who have done all kinds of things and been fine, it's just because they haven't been caught or audited yet.Seek the guidance of a tax professional before doing anything (or at least educate yourself as best you can).  

It will be a tough explanation for a field agent if ever audited. 

Put clause you will have quarterly audit.

It still has not happened, and very, very few of the many thousands of clients we have established have been audited. 

Yes, that's what I was saying, the loan will be more likely to be audited after a modification, wait a couple years to mess with deeds, IMO, but even then, yes, the due on sale clause is real.

Not much different then Sched E on a 1040, except 1/3 the audit foot print in the 1065. 

If you have some sort of a print out from your own bookkeeping and your closing statement from when you bought it if it was in the past year, or last years tax return if you claimed it last year for the duplex it would be really simple for them to add it onto this years return and your whole return would likely be like $500 and would be covered by their audit guarantee.

Let me just add that while some have said they ahve been filing a certain way:  Do you know if the IRS has actually audited your returns? 

We help them with bookkeeping, setup, review, owners statement, audit trail and financials.

Be careful selecting codes as your business will be viewed on par with others, any large differences can trigger audits.