Yes, that's the correct way to do it. The personal portion of the real estate taxes should be carried to the Schedule A for itemized deductions.
If you go through the property taxes section in Deductions and Credits, there should be information on the screen that will tell you how much has been included automatically in the itemized deductions section of your return. You should not enter the amount in both places (home office and property tax deduction).
@stevek
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