Katie Sleep and her husband, Jonathan, lived in the same four-bedroom home in a Washington suburb for 23 years. After Ms. Sleep decided to retire, they began looking for a new house, and, after viewing a model home in a new development, decided to move to Leesburg, Va., about 40 miles from the city. In having their new home built, they saw an opportunity — not to downsize, but to create a far larger home catering to their every need.

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