Yes, if you sold the property in 2020 and did not rent it, it is reported under Sale of Business Property. Once you indicate the change in rental status, the Schedule E will be deleted, so print the depreciation worksheet and any other necessary information before that happens.
No. You have no expenses for 2020. Property must be available to to be rented to be able to take expenses. Any major improvement can be added to the basis.
From Pub 527:
Vacant rental property. If you hold property for rental purposes, you may be able to deduct your ordinary and necessary expenses (including depreciation) for managing, conserving, or maintaining the property while the property is vacant. However, you cannot deduct any loss of rental income for the period the property is vacant.
Vacant while listed for sale. If you sell property you held for rental purposes, you can deduct the ordinary and necessary expenses for managing, conserving, or maintaining the property until it is sold. If the property is not held out and available for rent while listed for sale, the expenses are not deductible rental expenses.
