These pictures come to me courtesy of Chris Ritter. He and his sister own them. His grandfather, Paul Ritter, was the first Swiss Consul in Yokohama and was later promoted to Ambassador to Japan. His family was close to the CB Bernard family. Chris was born in Honmoku in 1935 and his father Max was born in Yokohama in 1902.
I found this charming print of a watercolour by C B Bernard in your book:
https://app.box.com/s/82yxdxcv99apeunumst4
I carefully scanned and de-screened it, and I wonder: When was this painted? When was that house built? Is it indeed, as I deduce, on the plot number 157? There are today two houses on that plot, but there is still visible, a square outline, which matches the pictured house in size and orientation. The two houses are both much smaller, but are of a similar sort of style.
This is a mosaic of Google Maps of plot 157, the area enclosed by the two sets of steps to what was the beach, now a children’s play area:
https://app.box.com/s/x5wohijy33yg0y1lvn9a
The two houses on the plot are clearly seen, and there is a large square plot, containing them both, with a smaller square imprint, in the larger sqare, which could have been the house, now gone.