Website: Cushman & Wakefield, NEEA's BetterBricks

This assessment by BetterBricks and Cushman & Wakefield is the first to provide weighted comparisons of top U.S. office markets based on real estate fundamentals and green development considerations.

Researchers looked at retrofitting, leasing and sales of investment grade green office buildings in the 25 largest U.S. central business districts to compile an index that compares a market's relative position to its peers in six categories:

-- Office Market Conditions
-- Investment Outlook
-- Green Adoption & Implementation
-- Local Mandates & Incentives
-- State Energy Initiatives
-- Green Culture