The issue is how the MLS (multiple listing service) allows listing of condos/apartments/etc. Since each unit has no actual land to itself, they're allowed to list the total land that the complex sits on for each unit. There's also basically no oversight or correction on what gets listed, so listing agents have no reason to be accurate or perspicacious.

Everyone then scrapes or subscribes to the MLS data. It's why you have a dozen identical realty sites: Zillow, Realtor, Redfin, Trulia, etc.

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