image © Daniel Schwen via Wikimedia Commons
Empire State Building
Just last fall, New York City's most iconic building received LEED Gold certification
. After undergoing a massive $100 million green upgrade (part of a larger $550 million renovation), the Empire State Building
is now one of the Big Apple's greenest buildings. The retrofit included replacing the 80-year-old building’s windows with double hung operable windows and installing an energy efficient heating and cooling system, which will help cut the building’s energy consumption by more than 38 percent and should save $4.4 million in energy costs.