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property taxes do not necessarily represent the relative Fair Market values of Land and Building.

According to [Reg. §1.168(i)-4(b)]  when a personal asset is converted to business or income-producing use, the basis or investment for depreciation is the lower of the adjusted basis on the date of the conversion or the fair market value (FMV) of the property at the time of conversion. talk to some realtors in your area.