Stockholders or other interested parties who wish to communicate with our
board of directors or specific individual directors may do so by letter sent
to our principal executive offices at 301 Howard Street, Suite 1100, San
Francisco, CA 94105, addressed to the attention of our Corporate Secretary.
Our Corporate Secretary reviews all communications and forwards them to the
intended recipient(s) consistent with a screening policy, which provides that
sales materials, routine items, and items unrelated to the duties and
responsibilities of the board of directors are not relayed to directors.