Two Houses, One Glass Gallery — A Multi Generational Estate In Minamigaoka For Sale

Property Highlights

The estate sits on 2,981.31 sqm of land in Minamigaoka, built by Sasazawa Construction, an established name in Karuizawa residential building. Two independent structures — a 377 sqm main house and a 210 sqm annex — are connected by an 11 sqm glazed corridor known as the Glass Gallery, bringing total floor area to approximately 598 sqm across seven bedrooms, each with its own ensuite bathroom. The two-building configuration allows multiple generations, or hosts and long-staying guests, to keep their own rhythm while remaining a few steps apart.

At the centre of the main house sits an east-facing courtyard — the architectural heart of the residence, conceived for morning coffee in soft early light, quiet reflection, and a fire pit on cool evenings. Floor-to-ceiling openings run throughout, dissolving the boundary between interior and forest and bringing Karuizawa’s four seasons directly into daily life. The living room pairs natural oak and limestone-like textures with fine bronze detailing, anchored by a fireplace and furnished by Stellar Works, whose pieces fuse East Asian sensibility with European modern design. The kitchen and dining area centres on a generous island, fitted with Miele built-in appliances and a Liebherr refrigerator, opening onto uninterrupted forest views.

A dedicated wellness wing houses a private sauna and a hinoki cypress bath, finished in natural stone beneath morning light filtered through the trees. The master bedroom opens directly onto the garden, with an adjoining dressing room and walk-in closet completing a self-contained private suite. All guest suites are designed as independent, private retreats, each with floor-to-ceiling glazing, forest views, and its own bathroom — suited to stays of any length. A separate entertainment and dining pavilion, opened fully to the outdoors through floor-to-ceiling glazing, extends the estate’s hosting capacity from an intimate family meal to a larger gathering. Whole-building climate control, floor heating, and a 24-hour humidity management system keep the residence comfortable through every season, with 24-hour security maintaining privacy throughout the year.

2,981.31 sqm of land. Approx. 598 sqm total floor area across two independent buildings connected by a glass gallery. 7 bedrooms, each with ensuite bath. Private sauna and hinoki bath. ¥2,200,000,000.

The Neighbourhood

Minamigaoka is one of Karuizawa’s most storied residential districts, set within mature forest and bordering one of the area’s most prestigious golf courses. The estate sits in quiet seclusion within this greenery while remaining approximately ten minutes by car from Karuizawa Station and the town centre — a balance of privacy and accessibility that has long defined the district’s appeal.

Why TonTon

This is the kind of asset that does not reach the open market through conventional channels. As the exclusive Japan licensee of Forbes Global Properties, TonTon operates at the precise intersection of deep local knowledge and a truly global network — giving our clients access not only to properties of this nature, but to the discretion, due diligence, and cross-border expertise that a transaction of this significance demands.

Our advisory team brings together backgrounds in international finance, Japanese property law, and cross-border transaction management — fluent at a native level in Japanese, English, Mandarin, Hindi, and Korean. From corporate structure establishment and tax advisory coordination to post-acquisition asset management, we provide end-to-end support across the full acquisition journey.

For clients whose ambitions extend beyond the visible, our private portfolio awaits.