noun
a separate living space within a larger residential property that is typically smaller in size and may have limited amenities
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The local zoning laws permit the construction of an accessory apartment on the property.
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My aunt is considering building an accessory apartment in her backyard for extra income.
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I heard Sarah's parents are converting their garage into an accessory apartment.
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Adding an accessory apartment to your home can be like having a built-in rental property.