Agreement between lessee and lessor on the rent

A legal transaction entered into between the lessee and the lessor regarding the claim to rent, in particular the payment of rent, is effective in relation to the acquirer to the extent that it does not relate to rent for a period of time subsequent to the calendar month in which the lessee obtains knowledge of the devolution of ownership. If the lessee obtains knowledge of this after the fifteenth day of the month, then the legal transaction also is effective to the extent that it relates to the rent for the next calendar month. A legal transaction entered into after the devolution of ownership is ineffective, however, if the lessee had knowledge of the devolution of ownership when the legal transaction is entered into.