As I reported at the O’Reilly Radar, The White House used interactive mapping and open data illustrate excess federal property around the United States. Check out the White House excess property map to see what that means in practice. I’ve embedded a similar map from MapBox below.
Selling excess federal property will be challenging. In contrast, open source mapping tools are making storytelling with data easier – and cheaper.
E Pluribus Unum 
It is nice that they “illustrate”
excess federal property
around the United State, but I cannot dig into specific records about the properties, so not sure how useful the “illustration” is. I would have liked property specific data, not just knowing that they have “6 properties in some city” Not sure of the goal of this, a document with addresses would have been more valuable.
Guest: Please understand: this is a simpler version of the map that the White House created. I accept your critique of this data visualization and understand that you’d like more information. Please visit and explore the White House map to drill down in the way that you described:
White House excess property map
Howard and others, any knowledge of who developed this? Do you think it was an internal job or a contractor?