Helmsley Building goes for the gold

After a $100 million renovation complete with double-paned windows, an energy-monitoring system and revamped cleaning and waste disposal systems, the Helmsley Building at 230 Park Avenue has become the city’s first prewar office tower to receive LEED-Gold certification, the Observer reported. Monday Properties’ green makeover of the 1.4 million-square-foot building is slated to cut 7,000 tons of carbon emissions annually, and next up on the landlord’s greening list is 1440 Broadway, the 750,000-square-foot property near Times Square. ING, which occupies upwards of 200,000 square feet in the Hemlsey Building, has also received the LEED-Gold stamp for its executive offices after slashing its energy consumption in the building by 30 percent. [NYO]