Building size has outpaced the growth in the number of buildings over the past decade, according to the Commercial Buildings Energy Consumption Survey (CBECS). CBECS estimates that there were 5.6 million commercial buildings in the United States in 2012, comprising 87 billion square feet of floorspace. This level represents a 14% increase in the number of buildings and a 21% increase in floorspace since 2003, the last year for which CBECS results are available.