Providing commercial real estate listing information via a global communication network; providing an on-line computer database of current and historical real estate management and transaction information featuring confirmed sales transaction data, photographs, maps, and news stories relating to the commercial, industrial, retail and hospitality-oriented real estate industry; providing real estate information services, namely, searching, analyzing, tracking, managing, and reporting of current and historical real estate data, namely sales and transactional data, as well as photographs, maps, and news stories relating to the commercial, industrial, retail and hospitality-oriented real estate industry; providing information regarding commercial, industrial, retail and hospitality-oriented real estate properties; providing lists of tenants of commercial, industrial, retail and hospitality-oriented real estate properties