Advertising of commercial or residential real estate; lobbying services, namely, promoting the interests of international, real estate and nonprofit companies in the fields of politics, legislation, and regulation; matching consumers with professionals in the field of real estate; matching consumers with real estate professionals in the field of real estate services via computer network; matching potential buyers to facilitate co-ownership of residential real property; membership club services providing discounts to members on real estate commissions and mortgage fees; providing a database featuring real property tax information; providing an interactive real estate website which promotes housing and apartment properties through offering prospective tenants video walk throughs, property descriptions, text, price, location, maps and other information that would be influential to a prospective tenant in making a rental decision; providing marketing services for real estate; providing real estate leads for prospective purchasers; providing real estate video tours for marketing purposes; real estate advertising services; real estate marketing analysis; real estate marketing services; real estate marketing services in the field of real estate; real estate marketing services, namely, on-line services featuring the promotion of residential new construction, which also contains back office solutions for builders; real estate marketing services, namely, on-line services featuring tours of residential and commercial real estate; real estate sales management; real estate transaction auditing services