...
Warren Hall is about a 10-minute walk from the Hotel Shattuck Plaza and the Downtown Berkeley BART subway / underground train station. There are multiple ways to walk to Warren; the simplest is probably to walk 1/2 block on Allston to Shattuck, then turn left on Shattuck (you'll be walking north, with the Berkeley Hills visible on your right), then turn right (toward the hills) on Hearst Ave. towards Oxford.
...