[1] The Western-style mansion and garden were designed by English architect Josiah Conder[2] and were completed by 1917.

[1] Conder was called the "father of Japanese modern architecture"[3] and also designed Rokumeikan, Kyu-Iwasaki-tei Garden, and Holy Resurrection Cathedral.

The pond's shoreline is designed in the shape of the Kanji "心(Shin)", which means "heart".

Around the pond are Tōrōs (stone lanterns), artificial hills, water falls, islands, and a tea ceremony house.

[2] The garden guesthouse features in the popular series Umineko When They Cry.