Out on the range is the last place you would expect America's long-running obsession with big houses to be laid to rest. But four years ago Rachel Odom, an Oklahoma City home builder, began constructing an exclusive development where houses average just 1,800 square feet. That's far smaller than the homes of up to 6,000 square feet that her company had been building until then - and nearly 500 square feet smaller than the national average for new construction.

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