CoStar tracked the number of LEED or Energy Star certified buildings since 2006, and compared lease and occupancy rates to similar non-certified buildings.For example, LEED certified buildings had a 92% occupancy rate, and averaged a lease rate of $42.38 per square foot. In comparison, non-LEED buildings had an occupancy rate of 87.9%, and an average lease rate of $31.05 per square foot. In a building with 50,000 square feet of leasable space, that would mean a difference of over $500,000 in income.

Energy Star certified buildings, in comparison, had an average occupancy rate of 91.5%, with lease rates averaging $30.55 per square foot. Non-Energy Star buildings were at 87.9% occupancy, and leased at $28.15. While the difference here is smaller, it still means $160,000 in additional income in a 50,000 square foot building.

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