Answer:
Ford's theatre was turned into an office building by the War Department.
It was done because the authorities neither wanted the theatre to be operational in respect of Lincoln's assassination nor wanted to memorialize it, so they turned it into an office building.
Step-by-step explanation:
Ford's Theatre is a site of the President Abraham Lincoln's assassination. On 14th April 1865, Abraham Lincoln, the President of the United States was shot dead straight in the head by John Wilkes Booth. Since the assassination of the President, the cite was offered to the War Department by the owner John T. Ford.
The authorities then turned the building into an office building. The authorities and the public did not want the threater to be operational after the fateful event of the President Lincoln's assassination. Neither did they want to memorialize it, so they turned the building into an office building.