Revati,
DC used to host their data within the DOEE (Dept. of Energy and Environment) and titled them under the yearly benchmark. It seems they’ve moved their data into a GIS map, with a downloadable CSV spreadsheet. There is another interactive, and more visually interesting, map showing the same data here.
Boston hosts their energy data within the city’s Dept. of the Environment yearly benchmark report. The most recent data is downloadable in .xlsx form.
Data.gov is a great resource for open source energy data. However, if you’re looking for granular, municipal, building-wise energy benchmarks it is going to require some legwork and trial-and-error. Out of curiosity, what are you planning on using this data for? I’d love to hear more about this project.
David