In Brokamp v. Linneman (1923), 20 Ohio App. 199, 201, 153 N.E. 130, the lessor was aware for a period of approximately eighteen months that the lessee had subleased a portion of the leased premises and was contemplating the sale of his business and an assignment of the lease in violation of the lease agreement, but permitted the lessee to remain in possession of the premises and continued to accept rent. The court held that this constituted a waiver. Id.