A commercial property type used to maintain or occupy professional or business offices. Such properties typically house management and staff operations. The term office can refer to whole buildings, floors, parts of floors, and office parks. Office space that can be used for a variety of purposes is sometimes referred to as generic office space. Office properties may be classified as Class A, B, or C. Class A properties are the most functionally modern. Properties Classed B and C in the same market typically command lower rents because they are older and in need of modernization. They may not be as efficient or desirable as Class A properties because their design or condition causes functional problems.