Where plaintiff procured a tenant for defendant for a term of five years, the lease providing that if the property was sold, it should be ended, and the property was sold at the end of the second year, plaintiff was not entitled to commissions for the remaining three years of the lease as on an implied contract, although the sale was made to the tenant's wife, and the lease gave the tenant an option of purchase. Mears v. Jones, 102 Me. 485, 67 A. 555. See also Secs. 207, 456.