Architecture, Building and Structure Design Courtyard Drum Tower Refurbished Office by Ziyu Zhuang Courtyard Drum Tower, which is next to the tallest ancient landmarks of Beijing for more than 600 years – Drum Tower and Bell Tower - is transformed from a traditional Beijing-style courtyard-Siheyuan in Dongjiaogan Hutong. The design target was to build a timeless workshop whilst embracing the surround cultural context into the yard.