You may have heard the slogan, “the greenest building is the one that’s already built.”

Think about it: You’re using existing resources, and those resources are already on-site. For the parts of the existing building that you can adapt or fix, you don’t have to mine or cut down anything, you don’t have to transport anything, and you don’t have to clear a new site out of farmland or forest.

Here’s a nice article on TriplePundit about a renovation of a former military barracks in Ft.Carson, Colorado into an office building. The project cost only a quarter of what a new building would have cost, and is green enough to be submitted for LEED silver certification. And that’s particularly interesting, because my understanding is that military barracks were typically built cheaply, quickly, and with little thought for conservation.

Another great example is the Empire State Building—which spent $20 million to achieve annual energy savings of more than $4 million. That works out to better than 20 percent ROI—at a time when you can’t even get 1 percent in a savings account. Not a bad investment!

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I love hearing stories about old buildings, especially iconic and massive ones, getting a serious green makeover. The US Treasury Department HQ in Washington, which took 33 years to build (1836-1869), has just achieved gold-level LEED certification.

So now, if people say to you, “and what other historic large office buildings besides the Empire State Building have gone green?” you can cite this great example. (Via GreenBiz.com)

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Okay, we all know the usual places to put money are performing pretty badly right now. But get this: the Empire State Building is embarking on a massive energy retrofit that will return nearly 28 percent a year! The project will cost $13.2 million, not exactly chump change–but will slash energy consumption by 35 to 40 percent, and save $3.8 million a year (considerably more, if energy costs spike back up again). After the third year, that’s nearly $4 million going directly to the bottom line. If the improvements have even a 20-year lifespan, that $13.2 million investment would return $176 million, and that’s with stable energy prices. The number is much, much higher if you factor in average energy cost increases of 5 percent a year. (I’m not going to do the math here, because I don’t know all the factors we’d need to compute–but it’s sure to be at least $200 million, maybe much more).

Too bad we can’t put our Roth IRAs into renewable-energy retrofits .

Meanwhile, we can all learn from the creative thinking at Rocky Mountain Institute, which is doing the heavy lifting on this project–for example, remanufacturing the windows on-site to reduce trucking costs in fuel and money. For years, RMI has been generating this kind of holistic, big-picture energy planning that saves many times the cost, and quickly. I profile RMI founder Amory Lovins in my award-winning sixth book, Principled Profit: Marketing That Puts People First.

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