WASHINGTON — First came the gold decor in the Oval Office. Then President Donald Trump brought his Mar-a-Lago style to the Rose Garden before installing a new flagpole in front of the White House.

Now, Trump is unveiling plans to fulfill a long-held desire to add a state ballroom off the East Wing, a $200 million, 90,000-square-foot project that would be one of the largest renovations to the historic building in decades.

The project poses myriad questions about potential conflicts of interest and the feasibility of such an undertaking, which Trump expects to be completed before he leaves office. White House officials said the president and other donors would pay for the renovations but declined to give details.

In his six months in office, Trump has sought to reshape institutions in his

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