One of the "greenest" buildings ever built will hold its grand opening on Earth Day, April 22, in Seattle.

The Bullitt Foundation headquarters is a model for environmental construction. Features include a composting toilet, a rooftop solar array and a system to use rainwater.

The Seattle Daily Journal of Commerce reports ( http://bit.ly/15YqyUc) the Bullitt Center contains no toxic materials, including PVC or formaldehyde. And it's the first heavy timber office building built in Seattle since the 1920s.

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Information from: Seattle Daily Journal of Commerce, http://www.djc.com/