It is considered the oldest existing army ammunition depot in Japan (1880) and is designated as a registered tangible cultural property. While the design is a blend of Japanese and Western styles, it is a solid structural building with 60-cm thick brick walls plastered with plaster.
The Nogi Warehouse is also a great feat in that it survived the Nagoya air raids during the war by storing national treasures, such as paintings, measured drawings, and glass dry plate photographs here (the Honmaru Goten, a national treasure of Nagoya Castle, was destroyed in a fire two months later). Without the Nogi Warehouse, the faithful reconstruction of the Honmaru Goten would have been impossible, and the important cultural properties would have been destroyed by fire.
Incidentally, Kinshachi was to be taken down from the roof and buried in the ground, but it was destroyed by incendiary bombs caught in the scaffolding that had been set up to evacuate the castle. I wonder if Kinshachi squealed when it was burning.
日本に現存する最古の陸軍弾薬庫（1880年）とされ、登録有形文化財にも指定されています。和洋折衷のデザインながら、厚さ60cmもの煉瓦壁を漆喰で塗り上げた強固な構造建築物です。
なにより戦時中、本丸御殿にあった国宝の障壁画・実測図やガラス乾板写真などをここで保管したため、名古屋空襲を逃れた偉業ある倉庫なのです（国宝名古屋城、本丸御殿は2か月後に焼失）。乃木倉庫がなければ、本丸御殿の忠実な復元は不可能、重要文化財も焼失したはずなので、名古屋城の歴史的にも重要な存在であるのですが、如何せん奥まったところにあるのであまり人気はないのです。
ちなみに金シャチは屋根からおろして土に埋める予定でしたが、避難させるために組まれていた足場に焼夷弾が引っかかり焼失。金シャチ・・・燃えてるとき鳴いたかな。