Key legal question
Whether the tenant could refuse return of the leased property because the landlord allegedly lacked lawful possession under the BewG.
Extracted holding
No. The landlord's possession of the rented property was not unlawful under the BewG, and the tenant had to return the premises to the landlord after termination.
Extracted reasoning
The BewG makes the unlawful acquisition of ownership void, not mere possession. The nullity of the acquisition does not alter possession automatically; only separate proceedings or precautionary measures could do so.