Borrowed Steel: A House Clamped to Three Legs of a Working 500 kV Tower

Above the Odo-no-Seto strait in Kami-Amakusa, Kumamoto, the sky is not empty. Kyushu Electric Power's 500 kV-class Reihoku line crosses the water in a single 1,463 m span, and the clearance around its conductors leaves a measured blank nobody else can use. A weekend house is proposed there. Owning no ground, it borrows what society has already built: tower Kai-3, 194.5 m, 975 tonnes, in service since 1995. Transmission never stops. Each floor is one room around an existing leg that stands like a hearth, with engawa decks between room and sky. Living stops at +123.72 m, set by clearance to the