A Green Landmark January 14, 2011 : 4:15 PM

The Empire State Building is well on its way to becoming a green landmark:

“Amid a more general makeover, the owners of the Empire State Building have spent the last couple of years burnishing the 80-year-old landmark’s green bona fides as well — chiefly though a series of efficiency upgrades and other energy retrofits.”

“On Thursday, the building’s caretakers announced another milestone: it has become the largest commercial purchaser of renewable power in the state.”