Not necessary. The only thing reported on sch A is the amount of interest.
The program asks for dates to use worksheets behind the scenes for the limitations. I am going to assume that your mortgage interest is below $750,000 for your share of the building. In that case, any date will work in the program.
If your interest is higher, please see the instructions for calculating the allowed amounts and just enter the allowed amount. About Publication 936, Home Mortgage Interest Deduction
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