Kaitsū Ltd. Brick Remains

These are the remains of a brick building from the 1880s that housed Kaitsu Ltd., a Japanese-​run company (which is significant because of its proximity to Kannai, which was initially for the residences and businesses of foreigners).
The original building was almost entirely destroyed in the 1923 Great Kantō Earthquake (as you can see in the photographs displayed here), but this section remained and was incorporated into the walls of another building. (Incidentally, there was a bar on the second floor, which I went to once in 2008 or 2009, with no clue there was a Meiji era treasure hidden in the walls downstairs.) When that building was being torn down in 2014, the original remains were discovered and the owner almost miraculously decided to preserve them. Since then, they have been reinforced and large panels with photographs of what the building looked like ca. 1905 as well as an informational plaque have been added. Sadly the plaque is only in Japanese.
The remains are at the same intersection as the Port Opening Memorial Hall («Jack») and the prefectural capital building («King»), so they’re easy to find.