Classify a personal agreement from its terms, registration and parties. Check whether it is legally a lease, whether it was entered in the public registers and which party it names.
Under section 1095 ABGB, a registered lease is treated as a right in rem for its remaining term and the subsequent owner must respect it. Section 1120 ABGB addresses an unregistered lease. If the leased property is sold and handed over to the purchaser, the tenant must yield to the new owner after due notice. The tenant may claim full compensation from the landlord for loss suffered and profit lost.
Those rules concern leases. A separate permission, operating agreement or personal consent needs its own review. The contract and circumstances determine transferability, consent requirements, term and the effect of a change in ownership.