We have reserved a block of rooms at the Hotel Durant. Call and identify yourself as part of the Lenstra conference and you'll get the UCB discount. Phone numbers and information on other places to stay is available at the MSRI Housing Information site. The best deals for budget travelers are at the two faculty clubs and at local bed and breakfasts where the price typically includes hotel taxes.

Be sure to make your reservation early since places near campus, especially the inexpensive ones, are in very short supply.