What the agreement says about the cancellation of lease ? any specific conditions are mention in the lease agreement which you entered in to the partnership firm .Section 65 in The Indian Contract Act, 1872 says that
obligation of person who has received advantage under void agreement, or contract that becomes void. Actually you entered in to a contract with partnership firm not to individual. When an agreement is discovered to be void, or when a contract becomes void, any person who has received any advantage under such agreement or contract is bound to restore it, or to make compensation for it to the person from whom he received it.