Which of the following is a condition under which a landlord must maintain the property?

The correct answer relates to the landlord's obligation to maintain the property, which is particularly influenced by the nature of the lease agreement. When a property is furnished, it typically implies that the landlord has made specific commitments, either through formal contracts or implied standards, to keep the property in good condition for the tenant. This involves ensuring that all furniture and appliances provided are functional and maintained, adding to the overall livability of the space.

Conditions regarding what a landlord must do regarding property maintenance often stem from local laws or lease agreements, where furnished properties generally have higher standards to meet due to the added items included in the rental arrangement. If a property is furnished, the landlord's responsibility to maintain it can also extend to the upkeep of these furnishings, further solidifying their obligation towards maintenance.

In contrast, the other options do not establish necessary conditions for maintenance. A verbal agreement lacks formal standing compared to written contracts, weakly supporting a claim for specific maintenance responsibilities. Tenants requesting maintenance often prompts action, but it does not fundamentally create an obligation unless previously established by the lease. Similarly, a landlord's personal interest in a property doesn't automatically impose a duty to maintain it unless it's reflected in the lease terms, which is not a universal condition.