City government-led energy efficiency challenges engage private sector building owners, operators, and tenants as partners in helping meet city-wide climate and sustainability goals.

Denver’s Lease for Efficiency factsheet promotes its program aimed to drive more efficient spaces for tenants in leased commercial real estate buildings.

The New York City Carbon Challenge is a voluntary leadership initiative and public-private partnership between the NYC Mayor’s Office and leaders in the private, institutional, and non-profit sectors who have committed to reduce their greenhouse gas emissions by 30% or more over ten years.