You have not provided enough information about your situation to be able to clarify the calculation.
However, keep in mind that the basis for depreciation may be lower than you expect. It is not the cost of the property, it is the cost of the property minus the cost of the land (which is not depreciated).
The table below will give you the percentage used to calculate the depreciation for the first year based on the month the property was placed in service. If you placed it in service in March, for example, look at the percentage under column 3.

Additionally, here is a link to further information about depreciation from the IRS:
Publication 946 (2023), How To Depreciate Property
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