Maintain a change report for move-ins, move-outs, renewals, transfers, rent changes, concessions, and unit-status changes. For each change, keep the property and unit, tenant or lease identifier, effective date, prior value, new value, source document, person entering it, and approver.
The bookkeeper can enter a signed lease, approved amendment, or property-manager instruction under a documented process. The bookkeeper should not set rent, alter lease dates, grant a concession, or mark a unit occupied or vacant based on an informal message without the required authorization. Restrict edit rights in the property system and use named accounts with multifactor authentication where supported.