For NYC dwellers on the hunt for an apartment, green residences might seem more of a nicety than a necessity. But by 2030 high-rise city real estate is going to get a whole lot greener, and hopefully a whole lot more affordable. A recent study has found that simple energy-conserving technology can save landlords bundles, and the statistics endorse New York City’s continued push for citywide environmental initiatives. To keep the city’s green-o-meter rising, new laws mandate many large buildings keep a public tab on their energy efficiency. The desired outcome is green new developments and retrofitted buildings. But what will the impact of all this paper shuffling be for renters, and does this look like a greener NYC or a pipe dream?