"Should we report everything $0 on the final return then?"

There would have been payroll wrap up, for Jan 2021. There would have been payments made in 2021 against 2020 year end payroll, such as FUTA and other closing payments or outstanding events. It matters if this was a cash basis or accrual basis entity. It matters what activities happened in 2021, and what happened to "close" whatever this entity did for business.

You never explained how the real estate matters to the S corp.