No. The entire cost of the second house is an depreciable asset and is not a land improvement. You would classify it as rental real estate in the assets/depreciation section of your return. You will begin depreciating it when you put it into service as a rental property.
Since the 2nd house was not complete and not ready to be rented in 2020, you will not report this on your 2020 return. It will be considered placed in service when it is complete and ready to accept renters.
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