This section is from the book "American Law Of Real Estate Agency", by William Slee Walker. Also available from Amazon: American law of real estate agency.
Plaintiff, employed by defendant to sell or trade certain land for him, procured an agreement for a trade with the owner of other lands, but, before the deeds were delivered by the parties, on plaintiff's claiming commissions from agents of defendant, to whom he had meantime given control of all his real estate, they declared the trade "off". Held, that plaintiff could recover commissions from defendant if such exchange was so broken off or rescinded by his authority. Blaydos v. Adams, 35 Mo. App. 526; Cotton v. Meadows, 147 S. W. 221, 163 Mo. App. 723; Johnson v. Stewart & Bay Bdg. Co., 153 S. W. 511, 171 Mo. App. 543; Hull v. Eidt-Summerfield Co., 204 S. W. 480, - Tex. Civ. App. -; Stout v. Thornhill, 79 S. W. 154, - Tex. Civ. App. - .
Broker entitled to commission for an exchange which the owner wrongfully refused to complete. Hege, Hachez, Phillips & Co. v. Hessel, 107 P. 375, 57 Wash. 499. *
 
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