According to the May 2003 NADS, the LSA/ADS/ANS hotel is the Sheraton Back Bay at 39 Dalton St. Their conference rate is given as $109.00 per night. I just booked a room at the Hilton across the street for $93.60 per night (including taxes and service charges), and this is a deluxe room; they have them cheaper (AAA rate).