Donald Trump Donald John TrumpBubba Wallace to be driver of Michael Jordan, Denny Hamlin NASCAR team Graham: GOP will confirm Trump's Supreme Court nominee before the election Southwest Airlines, unions call for six-month extension of government aid MORE’s fortune has shrunk $800 million since last year, according to a Wednesday report from Forbes, which pegs the GOP presidential nominee's worth at $3.7 billion.

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New York City’s real estate valuations are trending down, the magazine said, particularly in office and retail, shrinking Trump’s estimated purse.

Forbes, which says it's "been scouring Trump's fortune for 34 years," scrutinized 28 assets or asset classes belonging to Trump, finding 18 had declined in value.

Trump’s diminishing assets, it said, include Trump Tower on Fifth Avenue in midtown Manhattan and 40 Wall Street in downtown New York City.

Another property with dropping value is Mar-a-Lago, Trump’s private beachfront club in Palm Beach, Fla.

Hillary Clinton Hillary Diane Rodham ClintonJoe Biden looks to expand election battleground into Trump country Biden leads Trump by 12 points among Catholic voters: poll The Hill's Campaign Report: Biden goes on offense MORE, Trump's Democratic presidential rival, has frequently criticized him for not publicly releasing his tax returns and clarifying his business record. Clinton says Trump may be paying little or nothing in taxes or that he may have questionable overseas investments.

Trump has countered he is under an IRS audit and will publish the documents once it concludes. The IRS, however, has said its audit does not prevent the billionaire from releasing his tax returns.

Clinton’s allies, meanwhile, have seized on Trump’s reluctance over his tax returns as proof he lacks transparency.

Senate Minority Leader Harry Reid Harry Mason ReidOn The Trail: Battle over Ginsburg replacement threatens to break Senate Democrats fear Russia interference could spoil bid to retake Senate Graham signals support for confirming a Supreme Court nominee this year MORE (D-Nev.) said last week Trump’s failure to release the documents shows he is “faking” his net worth.