A commercial building refers to any structure primarily used for purposes other than residential living. These include spaces designated for industrial, retail, institutional, and public uses. Examples encompass office buildings, warehouses, manufacturing plants, educational institutions, healthcare facilities, recreational centers, hotels, and places of worship. The classification excludes multifamily housing and parking structures but covers diverse categories like laboratories, libraries, and governmental buildings. This broad definition ensures clarity in energy usage studies, zoning laws, and real estate classifications.