35 real estate marketing services, namely, on-line services featuring self-guided tours of apartment and residential housing unit for rent; real estate marketing services, namely, on-line services to identify apartments and residential housing units for rent in response to user input; computer services, namely on-line services for the marketing and promotion of apartments and residential housing units to prospective tenant; computer services, namely, on-line services using artificial intelligence machine learning models for lead generation and tracking of prospective tenants and customer relationship management for owners and managers of apartments and residential housing units; virtual assistant services, namely, business administration services and virtual staffing for owners and managers of apartments and residential housing units; business and consumer research services in the field of apartments and residential housing units; Online real estate brokerage services in the nature of lease negotiation and management of lease documentation on behalf of owners or managers of apartments and residential housing units