I would first create a parameter for each of the property characteristics from which the user can choose, i.e. Number of Floors, Sq Feet, Style, Purpose, Street, Zip, etc. Have a list of all the properties on the dashboard and as the user sets the parameters, filter down to what they are looking for. Depending on the number of parameters given, the list of available properties can be shrunken down very well. Be sure to give the user a way to export and/or print the list either to PDF or an Excel file.
I was also just thinking that you could have a container that provides shows a map of each site as it's name is clicked by the user or provide another parameter that swaps the map sheet for a picture sheet. Really, there are endlessly cool options with this project.