這棟三世代住宅坐落於東京寧靜的住宅區。因建地四周受其他住宅及公寓包圍，故將建築本體儘量推近建地北側，以確保南側的庭院空間。盡可能地擴大南面腹地後，便可以將採光及通風、還有庭院的綠意充分融入於生活空間當中，也多虧了這樣的配置，才讓上一世代悉心照顧的柿子樹得以保留下來。

考慮到上下樓梯帶來的負擔，將高齡雙親的生活空間配置於一樓，夫婦與小孩的三人空間則配置在二至三樓，這樣的安排讓與祖父母一同生活的八隻貓可以更加自由進出、暢行無礙，媽媽喜歡的庭園植栽修剪與鑑賞也更加輕鬆。且由於擔心兩個家庭會被上下樓層完全區隔，所以將南側庭院的一部分改為「樓梯狀」，自建築外側延伸至內側，並貫穿一樓至三樓。「樓梯」内部精巧配置了需要進、排水的廚房和廁所、以及樓層間移動用的樓梯等機能性空間，樓梯上部則成了像是綠意盎然的溫室一樣的半室外空間，對於喜歡登上高處的貓兒們來說，無非是最適合日光浴的絕佳地點。上下樓層因為這段樓梯和植物，以斜面和緩地串連在一起，讓三世代家族可以彼此相伴，卻又能輕鬆相處的空間就此誕生了。

這段樓梯不僅維繫了「内部與庭院」以及「家族彼此」，在平地的部分也連接到南側私有道路並繼續向外延伸，樓梯上部則是穿過天頂照明、彷彿可以直達天際，其用意是希望藉由像這樣與周邊及街道的連結，為這棟建築帶來廣度。

This project is a two-family home in a quiet residential area of Tokyo. With other houses and apartment buildings pressing around the site, the architectural volume was pushed to the north to take in daylight, ventilation, and greenery of the yard into the living environment by a large glass front southern facade. The layout plan made it possible to preserve the existing persimmon tree beloved by the previous generations.

Considering the potential difficulties of going up and down the stairs, the rooms for the older couple were arranged on the 1st floor. The eight cats living with the older couple roam in and outdoors more freely, and encourages the mother to enjoy her hobby of gardening more freely. The younger couple and their child reside on the 2nd and 3rd floors. To avoid the two households being completely separated at the top and bottom, a “stairway-like” structure was designed in the south yard, continuing upward into the building and penetrating the 1st through 3rd floors.

Enclosed inside the “stairway” are functional elements, such as bathrooms and a staircase for actual use, with the upper part taking on the look of a semi-outdoor greenhouse with abundant greenery as well as a sun-soaked perch for the cats to enjoy climbing. And so, a stairway and greenery gently connected the upper and lower floors along a diagonal line, creating a space where all three generations could take comfort in each other’s subtle presence. Not only does the stairway connect the interior to the yard, or bond one household to another, this structure aims to expand further out to join the environs and the city - connecting the road that extends southward on the ground level, and out into skylight through the skylight.