Bird Park, an unusual housing development in the Ebisu district of Tokyo, is surrounded by multi-storey office blocks. Occupying a nar-row urban site, the present building is situated in such a way that the residents of the six spacious apartments see very little of the neighbouring structures. The many trees along the south-eastern boundary of the site are up to 20 metres in height and were retained to lend the dwellings a special quality. “Little huts” attached to the main volume rise beneath the treetops. Housed in these individual oriel-like structures are the bathrooms, an introverted study/reading room and a large bedroom, the whole forming an annex on the east face of the building.