Which area type consists of spaces used by all tenants including common areas?

The area type that consists of spaces used by all tenants, including common areas, is correctly identified as the common area. Common areas are shared facilities or spaces that are accessible to all occupants within a building or complex, such as lobbies, hallways, restrooms, and recreational areas. These spaces facilitate interaction among tenants and often enhance the functionality and appeal of the property.

Understanding common areas is crucial for building design and tenant experience, as they account for a significant part of the overall space use within a property. When calculating the total area available to tenants, it's important to recognize that these shared spaces contribute to the overall usability and comfort of the building.

The other area types mentioned do not align with the concept of areas utilized by all tenants. Tenant area typically refers to the spaces that are exclusively rented by an individual tenant and do not include shared spaces. Usable area generally describes the space that a tenant can occupy and utilize, often excluding areas such as walls or structural components. Rentable area, on the other hand, includes usable area and a proportionate share of common areas but does not define the spaces themselves as common.