Key legal question
Whether the lease notices were null because the real estate agency signatories lacked power to bind the agency
Extracted holding
The notices were valid; the agency could bind the landlords by direct representation, and the agency ratified the notices in any event.
Extracted reasoning
The notices complied with mandatory written-form requirements. The agency's relationship as representative was clear, the signatories acted under the agency name, and there was no indication that the board had not empowered them. In any event, the agency expressly confirmed the termination motive afterward, amounting to ratification.