Office building下沉庭院平面图

Quick answer：

A 'sunk courtyard' in a office building typically refers to a courtyard that is lower in elevation compared to the surrounding building. The 'plane view' or 'floor plan' would depict the layout of this courtyard in relation to the building's structure, showing the spatial arrangement of floors, walls, and any features within the courtyard. This type of plan is essential for architectural design and construction, ensuring proper integration of the courtyard with the building's overall design.