Another dataset that the city of San Francisco makes publicly available is the Department of Building Inspection's monthly permit report. This report contains all the building permit activity within the city, from permits to add new condos to inspections of sprinkler systems. We took one full year of data, from September 2008 to August 2009, and brought it into SpatialKey. During the selected year-long time period there were over 25,000 permits issued. We can see the breakdown by the type of building on the right. Residential housing takes the top three spots (divided into Apartments, and one and two family homes).