Like real estate, GIS is all about "location, location, location." Esri offers a variety of GIS–based solutions designed for all segments of the real estate business such as map–based content management and sophisticated investment analysis.
GIS allows you to integrate a wide variety of data into one, common format—a map. Presenting your customers with a visual representation of all the information affecting the desirability and value of a property can give a far more accurate picture of a property's suitability to their needs.
Take a look at case studies and books and white papers.