Truth and fiction in real estate square footage

From Zillow blog

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An inch is an inch is an inch. Or so you’d think. But when it comes to measuring the square footage of a property, it’s not quite that simple.

I doubt there exists a buyer in the entire world of real estate who hasn’t asked, at one time or another, "What is the square footage?" of a particular property. The fact is, however, that measuring the size of a home isn’t an exact science.