Of the more than 22 million houses added between 2005 and 2024, the majority — about 13.5 million — were still single-family detached homes, representing a 17.8% increase. But housing in structures with 50 or more units nearly doubled. During that same period, 4.4 million more units were built, a 77.4% increase to 10.2 million in 2024

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