From the U.S. DOE:
The Energy Department has launched the new Buildings Performance Database, the largest free, publicly available database of residential and commercial building energy performance information.
This database will allow users to access energy performance data and perform statistical analyses on more than 60,000 commercial and residential buildings across the country, and new records are being added regularly. The database includes buildings’ location; age; size and function; electricity and fuel consumption; equipment information and operational characteristics. The data can also be used to compare performance trends among similar buildings, identify and prioritize cost-saving energy efficiency improvements, and assess the range of likely savings from these improvements. An application programming interface (API) will allow external software developers to incorporate analytical results from the database into their own tools and services.
Learn More About the Database Including Analysis Tools