Kirk here with something about the Janes Mansion (Janes Residence; ジェーンズ亭) and German prisoners of war in WWI. The color photo is of the reconstructed Janes Mansion, which is looking quite nice now and will be open to the public this fall, as I understand it. For background on the historical importance of the residence see the following:
Reconstruction efforts begin Birthplace of Japanese Red Cross Society, “Janes’ Residence” https://www.jrc.or.jp/english/jrc_news/170401_004771.html
The second image is of German prisoners of war relaxing on the porch of the Janes Residence in during WWI. It’s a screenshot of the following page:
https://www.asahi.com/articles/photo/AS20221129003101.html?iref=pc_photo_gallery_5
They got to stay in the Janes Residence because they were officers. Also, it seems that Japan was generally quite careful to adhere to the Hague Convention and not abuse POWs:
A Forgotten Tale of World War I: Life for German POWs in Japanese Camps https://www.nippon.com/en/in-depth/a03303/
So, it seems that German officers had particularly nice accommodations in which to wait for the war to end.
P.S. It if often rendered the “Janes’ Mansion” with an apostrophe to indicate the possessive, but that seems odd to me. Of course, “L.L. Janes’ Mansion” is fine but when the family name modifies a word like “mansion” or “estate” in the name of a site, it seems to me that the possessive is out of place. As a case in point, it’s the Vanderbilt Mansion, not the Vanderbilt’s Mansion: