Donald Trump falls from No 156 to No 248 on the latest Forbes list of the 400 richest Americans.
The magazine says the US president's wealth has declined $US600 million to $US3.1 billion over the past year.
While the US stock markets have boomed in 2017 – as Mr Trump never tires of pointing out – most of the president's inherited wealth is tied up in real estate; the bulk of it in six buildings in Manhatten.
To add insult to injury, Forbes ranks the US president at number two on its international power list, behind Russian president Vladimir Putin.
Forbes blames a variety of factors for the president's reversal of fortune.
"A tough New York real estate market, particularly for retail locations; a costly lawsuit and an expensive presidential campaign all contributed to the declining fortune of the 45th president," it says.
The core of Mr Trump's fortune is "tied up in a half-dozen buildings in and around midtown Manhattan in New York City where luxury real estate values have fallen recently."
Bill Gates ($US88.8 billion) continued to top the Forbes 400 list, followed by one of Mr Trump's many enemies, Amazon founder Jeff Bezos ($US85.5 billion) and Facebook founder Mark Zuckerberg ($US73.1 billion).
Another of the president's foes, Bloomberg founder Michael Bloomberg, came in at No 8 with a net worth of $US47.7 billion.
Mr Trump, who refuses to release his tax returns, maintains his wealth is in excess of $US10 billion. That figure includes an undisclosed estimate of the value of his brand.
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