The Cecil and Ida Green Building, or Building 54, is the tallest building at MIT at 300 feet. It houses the MIT Department of Earth, Atmospheric and Planetary Sciences. The MIT Weather Radar Laboratory is also located there.
Here is a picture of the Green building; here is another picture.
Several times, people have hacked the Green building to display messages with its lights. A long-standing dream (as yet unrealized) is to program the lights to play Tetris down the 300-foot face of the Green Building.