What subject was Donald Trump good at in elementary school, do we think? He’s proved weak on history and has betrayed an unconventional sense of syntax. He is very good at writing his name. Now—or once again, rather—it’s clear math is more of a creative activity than a precise one. Forbes took a moment to fact-check a claim that Trump made while he was still on the campaign trail in 2015 regarding his Trump Tower residence.

At the time, Trump claimed the apartment was 33,000 square feet total and was worth “at least $200 million.” He told Forbes, “I own the top three floors—the whole floor, times three!” The publication found that following some expansion in the 90s, Trump’s residence has maintained an underwhelming size of 10,996 square feet, which, much like his hands, is about a third of what he says it is.

The tower itself is 10 floors shorter than it actually is, due to some height fudging on Trump’s part in the early 80s, according to a recent New York Times piece. The president’s proprietary take on math is here:

Though the tower was built with 58 floors, Mr. Trump later explained to The New York Times that because there was a soaring pink marble atrium and 19 commercial floors at the bottom, he could see no good reason not to list the first residential floor as the 30th floor. The pinnacle became the 68th—the height that appears in marketing materials, online search results and news articles to this day.

So the exact height of the president’s tall tales is 10 stories. This has become a sort of real-estate practice that the city, developers, and residence all buy into from then on, according to the Times. Yes, Trump once pioneered a mutually agreed upon delusion that is all smoke and no substance for an entire industry.

Vanity Fair has reached out to the president’s team for confirmation.