건물의 지붕은 원래 동판으로 덮고 사방에 난간을 둘렀으며 자연광의 일조량이 충분히 흡수되도록 반원형의 채광창을 설치하였다.
The roof of the building was originally covered with copper plates, and handrails were placed all around, and a semi-circular skylight was installed to absorb enough sunlight.