A system and method for targeting advertisements to tenants in a building by providing a portal for a building accessible via the Internet with the portal based upon the specific needs of targeted advertising in the building. Advertisements are received from a user of the portal and the advertisements are distributed to a target audience in the building that is determined based upon historical transaction data for the building. A user is provided with the historical transaction data of previous transactions by tenants in the building. The portal is designed to suit the specific needs of a building.