Class "A" Office
Class A buildings can be characterized as buildings that have excellent location and access, attract high quality tenants, and are managed professionally. Building materials are high quality and rents are competitive with other new buildings. In practical terms, the office buildings that you see in the heart of the financial district with lots of granite, marble and glass, and huge, expensive lobbies are examples of Class A office buildings. Class A office buildings are usually steel-framed and tall. They are often occupied by banks, law firms, investment banking companies, and other high-profile companies.
Class "B" Office
Class B buildings have good (versus excellent) locations, management, and construction, and tenant standards are high. Buildings should have very little functional obsolescence and deterioration. In practical terms, Class B buildings can be built as Class B buildings or may be older, former Class A buildings. Class B office buildings may be found in the suburbs or the less-pricey areas of major Central Business Districts.
Class "C" Office
Class C buildings are often 15 to 25 years old. Class C buidlings are typically characterized by lower quality finishes and outdated building facades and interior spaces.