A system, method, and computer program product for providing a real estate lockbox. The real estate lockbox manages access over a network to real estate data by restricting access to certain real estate data while providing free access to other real estate data. Access to the restricted, private real estate data may be gained by receiving a real estate lockbox key. As a result, the real estate lockbox serves a similar function as a physical real estate lockbox, but in an online environment—allowing casual access to public real estate data, but requiring more secured access to private real estate data. In one embodiment, the present invention also provides real estate search toolbar in the form of an API to facilitate searching for real estate over a network.