Iacocca Hall 111 Research Dr Bethlehem, PA 18015Google maps
The best way to get there is by car and the following link gives the general driving direction:
Directions to Iacocca Hall on Mountaintop campus at Lehigh U.
You can also take public transportation (not very convenient though). There are buses running between Bethlehem and NY and Philly: Trans-Bridge Lines or Bieber bus. These buses will get you to the Asa Packer campus and then school buses can get you to the Mountaintop campus.
Here is a link to the parking map.