The steel-frame structure is covered in recycled Douglas fir. The structure is covered in windows, so much on the lower level that when viewed from the side or at an angle, you can see all the way to the trees on the other side. Though four stories tall, the structure does blend in well with the surroundings.
Unfortunately, the article states in all seriousness that "the house is not enormous [at] less than 4,900 square feet."
Architecture and Interior Design by Selldorf Architects
See the original article here or in the January 2009 issue of Architectural Digest.