Which expense is related to keeping the interior areas clean?

The expense associated with keeping the interior areas clean is janitorial costs. These costs specifically pertain to services that involve cleaning operations within buildings, such as dusting, vacuuming, sanitizing restrooms, and overall upkeep of interior spaces. Maintaining a clean environment is crucial for health, safety, and the overall aesthetic appeal of a property, which is why expenses directly tied to cleaning services are categorized as janitorial costs.

Real estate taxes are unrelated to interior cleanliness, as they are government-imposed taxes based on the value of property. Repairs and maintenance refer to fixing and maintaining the structural integrity and operational aspects of a property rather than routine cleaning. Grounds maintenance pertains to the upkeep of outdoor areas, such as landscaping and lawn care, which does not involve the cleanliness of interior spaces. Thus, janitorial costs are the clear choice for expenses related to interior cleaning.