This large Thai restaurant is set up in the 280 East Main shopping center and, while there are lots of parking spots, the lot can get very full during the lunch rush. This place is moderately expansive, with two large dining rooms of four and six tops, and is a very popular business lunch venue. Around 1pm, many of the tables are filled with suited businesspeople taking on steaming curries or pad thai plates. Chez Siam takes reservations here, however are usually not needed.