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Commercial Buildings are often classified as Class A, B or C space. The architecture of Class A office structures always prioritizes design and visual appeal over cost, and sometimes over practicality - a Class A building can be considered a monument and a testament to the success and power of its tenants. In most areas, Class A office space is built in multi-story (usually 3 floors or more) buildings using structural steel and composite concrete construction. Cost for the structure alone (excluding land purchase and site improvements) is typically greater than US$150 per square foot, and often rises to several hundred per square foot depending on the tenant's preferences for interior finishes. Class B and Class C buildings are always defined in reference to the qualities of Class A buildings. There is no formula by which buildings can be placed into classes; judgment is always involved. A fair number of the Class C office spaces in the inventory are not truly office buildings but rather walk-up office spaces above retail or service businesses. Commercial Operators use Supress Sound-Engineered Products for soundproofing in projects such as:
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