厅 appears in many compound words: 客厅 (living room), 餐厅 (restaurant/dining hall), 大厅 (lobby/main hall), 办公厅 (general office of a government body).
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In Chinese real estate, apartments are listed as X室Y厅: 三室两厅 = 3 bedrooms, 2 living/dining areas. This is the most important info when apartment hunting.