Article: Green building in Seattle

*If* this building proves popular, and *if* its construction is durable and reliable, I can't see how this won't end up being a huge economic, as well as environmental, win. I would, however, like to know *how* they are going to be disinfecting the rainwater from the cistern.
http://www.nytimes.com/2013/04/03/realestate/commercial/the-bullitt-center-in-seattle-goes-well-beyond-green.html?pagewanted=2&ref=general&src=me