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DENVER, CO - SEPTEMBER 27: Matt Williams nails the footer of a wall into place at Habitat for Humanity's Sable Ridge build site in Denver, Colorado on September 27, 2013. Habitat for Humanity will build 51 town homes at the Sable Ridge site over the next two years. (Photo by Seth McConnell/The Denver Post via Getty Images)

DENVER, CO - SEPTEMBER 27: Matt Williams nails the footer of a wall into place at Habitat for Humanity's Sable Ridge build site in Denver, Colorado on September 27, 2013. Habitat for Humanity will build 51 town homes at the Sable Ridge site over the next two years. (Photo by Seth McConnell/The Denver Post via Getty Images)