April 11, 2018, 8:24 a.m. by Lloyd Alter
1 in 5 Americans live in this situation, but the houses aren't built with this end goal in mind.
A gallery of 10 great green houses
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Check out this photo gallery of stunning eco-friendly houses.
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Iowa boy builds tiny house in his backyard
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Why every house should be designed for multigenerational living
Is this a housing revolution for aging boomers?