Systems and methods to provide targeted advertising use tracking of stages of prospective real estate purchases. Demand-side platforms may request information, e.g. one or more characteristics of a particular prospective real estate purchase, the information being related to either one or more particular device identifiers, or being related to one or more specified criteria for characteristics of prospective real estate purchases. In response to the request, a response is initiated. Content providers that provided content relevant to the response are compensated based on revenue received from the demand-side platforms.