Solved
When I rented out the apartment, I think turbotax prompted me to list real estate depreciation, but not now that I run it as a business.
Because you changed it directly from a rental to a Business, use the original "placed in service" date when you first used it as a rental. Then enter the proper Basis and "prior depreciation" from the rental. Do the same thing for any any other "assets" (furnace, roof, furniture, etc.),
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