I don't have verified facts in front of me giving the specific dollar figure ($900 million) or an official White House statement tied to that figure. I can't confirm a stated purpose for a "$900 million White House construction project" from anything supplied here — I'd be inventing a justification if I answered directly.
What I can say from general knowledge (not sourced/verified for this request): reporting on White House construction/renovation projects in this period has centered on a new ballroom addition, with the stated justification being to create a large event/reception space the existing State floor rooms can't accommodate, funded by private donations rather than taxpayer money. But I can't verify that this matches the specific "$900 million" figure you're asking about, so treat that as unconfirmed background, not an answer to the question as posed.
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