Building classifications in most markets refer to Class "A", "B", "C" and sometimes "D" properties. While the rating assigned to a particular building is very subjective, Class "A" properties are typically newer buildings with superior construction and finish in excellent locations with easy access, attractive to credit tenants, and which offer a multitude of amenities such as on-site management or covered parking. These buildings, of course, command the highest rental rates in their sub-market. As the "Class" of the building decreases (i.e. Class "B", "C" or "D") one component or another such as age, location or construction of the building becomes less desirable. Note that a Class "A" building in one sub-market might rank lower if it were located in a distinctly different sub-market just a few miles away containing a higher end product.