1. A computing system for enabling a lease transaction for real property in an on-line computing environment, comprising: a property management services server hosting a leasing software module for enabling the lease transaction; at least one database, coupled to said property management services server, storing real estate property-related data for a plurality of real estate properties; and a plurality of client computers coupled to said property management services server, at least one client computer operable by an owner and at least one client computer operable by a tenant, wherein the owner and the tenant input predetermined information about a selected real estate property into said leasing software module and negotiate an electronic term sheet using said leasing software module in support of the lease transaction for the selected real estate property, wherein said leasing software module accesses the property-related data on one of said at least one database to obtain data relevant to the selected real estate property, populates a lease agreement based on predetermined information from an owner of the selected real estate property and information in the electronic term sheet negotiated by the owner and the tenant, and presents the populated lease agreement and the comparables data for approval by the owner and the tenant.