President Trump plans to build a $200 million ballroom off the East Wing “long before” the end of his term in 2029.Experts on historic preservation are raising concerns over the feasibility of President Trump’s plans to complete large-scale renovations to the White House by the end of his term, and whether the project can be done while respecting the historic nature of the building.Mr. Trump unveiled plans on Thursday to construct a $200 million, 90,000-square-foot state ballroom off the East Wing to be completed “long before” the end of his term in 2029. The project would be one of the...