Advertising of commercial or residential real estate; Matching consumers with real estate professionals in the field of real estate services via computer network; Negotiation and renegotiation for others of leases and subleases and real estate purchase agreements; 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 real estate leads for prospective purchasers; Providing real estate video tours for marketing purposes; Real estate marketing analysis; Real estate marketing services, namely, on-line services featuring tours of residential and commercial real estate; Real estate sales management