Never panic!
There is a shuttle bus running round the CU campus. Once you got off the University Station and stepped into the main entrance, you see the shuttle bus stop. Then you got there and told the driver you want to stop at 何善衡工程樓, then OK! Everybody did like that, tell the driver your destination. You can ask the driver to remind you to get off when it reach 何善衡工程樓.
You don't even need to border the landmark.