A broker to procure a purchaser for real estate is entitled to such commissions as are usual for procuring a purchaser for property of similar character and value, unless a different compensation is agreed upon. Walker v. Baldwin, 106 Md. 619, 68 A. 25; Hollis v. Weston, 156 Mass. 357, 31 N. E. 483; Hart-man v. Warner, 75 Conn. 197, 52 A. 719; Lansing v. Johnson, 18 Neb. 174, 24 N. W. 726; Baer v. Koch, 21 N. Y. S. 974, 2 Misc. 334; Barrel v. Zimpleman, 66 Tex. 292, 17 S. W. 478; Phillips v. Roberts, 90 I11. 492; Roberts v. Markham, 109 P. 127, 26 Okl. 387; Taggart v. Hunter, 150 P. 738, 78 Or. 139, judg. rev. on re., 152 P. 871, 78 Or. 139; Thos. S. Jones & Co. v. Moore, 99 S. W. 286, 30 Ky. Law Rep. 603; Walker v. Baldwin & Frick, 68 A. 25, 106 Md. 615; Louva v. Worden, 152 N. W. 639, 30 N. D. 401; Matlock v. Jarabek, 164 N. W. 587, - Minn. Sup. - . See also Secs. 587, 615. Applies also to void parol contract. Robinson v. Willard, 16 0. C. C. 464.