There are many offices hidden in the Beijing Hutong. This Project is a unique one. The project was formerly known as Xicheng Drum Tower Coal-fired Plant. In the age of relying on coal-fired heating, it is the source of heat for the old courtyard. With the changes of the times, when the coal plant exits the original stage of the historical arena, it loses the bustle of the past, leaving only the large factory buildings and small courtyards.How natural light into the dark basement is the focus point during the design. DAGA design two lighting wells vertically through the entire building, bringing not only the sunshine to the basement but more to its actual functions. The staircase on the western leads to the roof from the basement. The light film under the staircase is fully intelligent and controlled. When someone passes, it slowly lights up and disappears when nobody use it. The green plantation grows slowly around the top of the eastern. The professional climbing wall becomes the coolest decompression way at work.