I would add that I know that Public Works used to have an energy use database for their buildings; they had all the records for their buildings. I'm not sure about the lease versus owned category, but that certainly is, as he said, a place to start. You could even create your own benchmarking using the buildings against each other, the same vintage, the same size, and by location. It would identify the outliers and you'd be able to improve those to meet the more efficient buildings in that same grouping.
On April 16th, 2013. See this statement in context.