The project site is a long and narrow residential building annex. Facing the long and narrow space, the designer used the method of space segmentation to horizontally divide the space into layered floor plans with distinct levels. Meanwhile, the original concrete material of the building framework was retained, and fine components were applied to create a strong contrast. In the vertical space, the patterns of the building were used to enhance the sense of vertical space, and pendant lights were used to separate the messy ceiling from the usable space horizontally. The entire office space was made functional through layout segmentation, resulting in a reasonable, appropriate and interesting layout.