Continuously in the same family's hands since the Ansei era of the Edo period, Nishimuraya Honkan has been welcoming guests to Kinosaki Onsen since 1854 — making it one of the longest-running ryokan in Japan and a living document of sukiya architectural tradition. The property's defining chapter arrived in 1960, when master sukiya architect Masaya Hirata completed the Hiratakan Annex, now registered as a cultural property of Japan. Hirata's work is legible in every joint and threshold: timber ceilings panelled in warm cedar, shoji screens filtering garden light into amber, tatami floors laid with the precision that sukiya demands. The central garden visible from the main reception rooms is composed with the discipline of a painted scroll — layered pine, stone lanterns, a carp pond — framed by deep overhanging eaves that contain the view as deliberately as any gallery wall. Across 29 rooms, the interiors balance historic fabric with quiet contemporary comfort. Beds sit low on tatami platforms, lit by bedside lanterns whose paper shades cast the same diffused warmth as the shoji beyond. The outdoor hot spring bath is ringed by tall bamboo and finished in hinoki cypress, the mineral-blue water fed directly from Kinosaki's thermal springs. Three in-house onsen baths and an on-site museum complete a property that functions less as a hotel and more as a coherent argument for the enduring intelligence of Japanese residential architecture.