500. Broker entitled to commissions on actual payment by defaulting vendee. 500a. Broker limited to commissions on $1,000, although property later sold for $12,500.

501. Broker's right to commissions not defeated because to be paid from purchase money.

502. Principal liable for commissions on sale to customer at lower price, unless fixed price required.

503. Where principal agreed to pay commissions upon receipt of price, broker not entitled before. 503a. Broker not entitled to commission for contract to purchase differing as to deferred payments.

504. Commissions are usually payable upon completion of the transaction.

505. Broker entitled to commissions although purchaser pays more than he authorized him to offer.

506. Where purchaser defaulted broker entitled to commissions on actual payments.

507. Cases where plaintiff was held not to be the procuring cause of sales, and not entitled to commissions. 507a. Broker who is the procuring of sale entitled to commission.

508. Where sale frustrated through 460 failure to partition, broker entitled to commissions.

509. Partial performance entitled broker to recover neither on contract nor on quantum meruit.

510. Agent in charge of real estate securing responsible tenant, entitled to recover on a quantum meruit.

511. On principal selling, broker could recover for services on a quantum meruit.

512. Principal selling for less than agreed price, broker entitled to recover on a quantum meruit.

513. In the absence of an express contract broker procuring a purchaser may recover on a quantum meruit. 513a. In absence of fixed rule measure of broker's compensation the value of the service rendered.

514. Demand by broker for $10,000 to release lien defeated his right to commissions. 514a. Owner entitled to counterclaim for expenses of suit to remove cloud on title caused by broker recording contract breached by his misrepresentations.

515. First broker held to have right to commissions by second's relinquishment.

515a. Waiver of variance in contract by acquiescence.

515b. Owner accepting purchaser waived requirement from broker as to financial ability.

515c. Broker must prove financial ability of purchaser, and ordinarily this not waived by owner's acceptance.

515d. Broker to recover commission must show that variance in purchaser's contract was waived by owner.

515e. Where owner paid second broker for furnishing purchaser, first having waived his rights, latter not entitled to recover.

515f. Waiver by party to exchange that other party should assume mortgage on former's premises.

516. If authority to secure a purchaser is revocable broker finding after barred commissions.

517. If the customer reserves the right to withdraw from transaction if title bad, if exercised bars commissions. 517a. On breach of contract to exchange lands, broker cannot recover from wrongdoer the commission agreed to be paid by other party.

518. Unless exclusive rival broker entitled to commissions on sale by the other.

519. Broker and sub-agent stand in similar relations as to compensation as do principal and agent.

520. Sub-agent entitled to share in commissions though he violated instructions. 520a. Broker liable to sub-agent though property on sale found not to belong to vendor.