Urban system (city as a system)
A complex and structured urban environment or system composed of highly diverse, interacting, and interdependent parts and activities aggregated or organized in such a way as to serve a common purpose and/or satisfy the needs and wants of people residing in and dependent upon that system.
Usable area
Rentable area, less certain common areas that are shared by all tenants of the office building (such as corridors, storage facilities, and bathrooms). Also defined in office buildings as the area that is available for the exclusive use of the tenant. Usable area = rentable area × building efficiency percentage.
User criteria
In reference to the identification and classification of properties and the evaluation of feasibility characteristics of various locations/sites in accordance with the specific needs of the user as defined by its business requirements, and the use and zoning restrictions in any given jurisdiction or municipality.