Advertising of commercial or residential real estate; Arranging, planning, and conducting tag sales, estate liquidation sales, yard sales or garage sales for others; 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; Real estate advertising services; Real estate auctions; Real estate marketing analysis; Real estate marketing services; 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