The Khoo Kongsi is the seat of the Leong San Tong Khoo clan — Hokkien Chinese who migrated from Fujian province and became one of the most powerful clans in colonial Penang. The kongsi (clan association) served as bank, court, social welfare system, and place of worship for its members. Its building reflects that power: an extraordinary assembly of carved timbers, ceramic figurines, painted murals, gilded columns, and granite stonework all competing for the eye's attention.
The main temple, Choo Cheng Kok, is dedicated to the patron deity Tua Sai Yah and reaches several stories with a sweeping roof ridge packed with mythological figures. The courtyard in front is surrounded by clan quarters and a small theatre stage where performances were held for festivals. Inside, the museum explains the history of the Khoo clan and the kongsi system. The surrounding Cannon Square neighbourhood — narrow lanes, old shophouses — is one of the most atmospheric in George Town.