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Brian Kraft & Doug Pickering, JMT. In cooperation with Washington DCâ€™s Historical Preservation Office, JMT has been collecting historical data on the buildings of Washington DC. For nearly a decade JMTâ€™s DC Historical Building Permits database has been a historical resource accessible to only a limited number of users. Now that data will be accessible through an interactive web based mapping application. Through this application the public will be able to view and search for historical data on buildings built before and after the range of the permits database, as well as the historic subdivisions of DC, which were digitized by JMT. This unique collection of historical data is being made available in a geospatial format for the first time and makes Washington the most well-understood major US city, in terms of its development history.