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Make your case in a letter to the IRS. Submit copies of any documentation that supports your claim. Or, talk directly to an agent by calling the phone number listed in the IRS rejection letter. If the real estate tax notice was in your name then you were allowed to claim the deduction even though the property was not your personal residence. You will need to show that your address was at a different location than the real estate tax you claimed.
If the IRS still denies your credit, request an appeals conference with your local IRS Appeals Office. You need to respond within 60 days to get assistance from a customer service representative and to have the right to appeal your case later in tax court.
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It still applies. The address on the tax bill should not be listed on any tax return as your home address. This would be your proof that the property was not your residence. I interpreted that the credit was for the First Time Homebuyer credit and since you claimed the real estate taxes on a tax return the IRS denied the credit because they assumed you were claiming the taxes on your residence.