sentences:  An extensive chimney breast was added to the fireplace in the room's west wall when it was reconstructed in 1817.A large greenhouse was added to the west side of the White House in 1857, replacing one on the east side which had been torn down that year to make way for expansion of the Treasury Building.The greenhouse burned down in 1867, and in 1869 President Ulysses S. Grant built a larger, higher greenhouse in its place.