This is from an old post with the same question:
This sounds like a mixed use property, where a portion is used for residential and the rest is commercial. You can use any reasonable standard to decide if this meets the definition of a dwelling, but the two most common are the square footage test and the income test. If more than half of the square footage is used as the B&B, then I wouldn't consider it a dwelling and would exclude from HMDA.
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