The roof of the top floor has gables of irimoya-roof facing the flat sides (the north and south sides) with a Kara-style gable built over the second floor on the north side to make the building appear larger, indicating that special attention is given to its exterior.
最上重の屋根は平側面（南北面）に入母屋屋根の妻側を向け2重目の北面に向唐破風を一つ付けた外観は建物を大きく見せるためと見た目を重視したためである。