If they were both rentals then you won't dispose of it at all. Sorry, I should have asked. I just assumed you had some depreciation in there.
So, your math just got a little harder. Your home office isn't going to change. Because it's a rental the only thing that is going to change is the amount of the deduction allowed for each office. You need to figure the amount of the actual expenses for the first three months at the old office and then the amount of the expenses in the 9 months at the new office and then you add them in. Then, for this year only, figure the square footage of your home office by percentage and work out the home office deduction based on that. (Take the percentage of the house used by the old office and multiply by three, the percentage of the house used by the new home office and multiply by nine. Add all together and divide by 12 to get the percentage for this year.)
@mgarvin
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