Concept:
For Use in Real Estate and other collection style organizational structures, use taxonomies, custom posts, tags etc to create a search system that allows one to drilldown among common features.
Should already be a default function in Real Estate Themes but I have yet to see one that provides anything more than an initial search function.
Initial Research Source:
http://fearlessflyer.com/2012/10/how-to-create-an-advanced-search-form-for-wordpress/
