This was published in the East Bay Monthly last summer:
In the West our buildings seem to transform with our tastes. Thirty year old malls are razed and replced with bigger and better malls and mid-century homes are renovated to respond to the whims of the new owners. It's no wonder that 20 percent of the waste stream in landfills is made up of construction debris.
http://www.advancedhomeenergy.com/images/PDF/EastBayMonthly.pdf