accessory apartment
noun
US
: a rental unit that is located on the lot of or within a single-family owner-occupied home
In 1991, the town moved away from an almost exclusive reliance on single-family homes and passed a law that began a process of legalizing some of Huntington's thousands of illegal accessory apartments.—Newsday, 14 Sept. 2010
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Merriam-Webster unabridged
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