WASHINGTON — Over the years, a genteel nonprofit organization called the Trust for the National Mall has raised money to help care for the cherry trees dotting the Tidal Basin. It upgraded the U.S. Park Police stables on the National Mall and hosted pickleball games on the grassy expanse between American monuments.

Now it has a new assignment: handling the millions of dollars pouring in for President Donald Trump’s gilded White House ballroom.

The nonpartisan group is serving as the steward for what Trump has said is more than $350 million in private donations from individuals, foundations and corporations to remake part of the old East Wing into a 90,000-square-foot ballroom.

Donors have been instructed to direct their ballroom contributions to the trust, a tax-exempt nonprofit o

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