Advertising of commercial or residential real estate; 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; Negotiation and renegotiation for others of leases and subleases and real estate purchase agreements; 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 the real estate industry; Providing real estate leads for prospective purchasers; Real estate advertising services; Real estate marketing services