Wall Street Journal contributor Katy McLaughlin reports that for both domestic and foreign buyers, the hottest amenity in real estate these days is an in-law unit, an apartment carved out of an existing home or a stand-alone dwelling built on the homeowners’ property.

Across cultures, age groups, and economic segments, more folks are adding an older or younger generation to the mix of primary householders. McLaughlin reports:

In an analysis of real-estate listings, homes with in-law units, technically called accessory-dwelling units (ADUs), were priced about 60% higher than houses without them, according to real-estate website Zillow, which examined the past four years of new listings in major cities.

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