A traditional Japanese space redolent of the Azuchi–Momoyama period

Teppanyaki Wajo is situated on the 12th floor of The St. Regis Osaka, its entrance on the right-hand-side when leaving the elevator. The panel bearing the restaurant's name was fashioned by a Kyoto metalwork artisan ordinarily tasked with creating decorative metal fittings found in Japan's castles, shrines, and temples. The lettering is carved in relief using a technique known as openwork, every undulation painstakingly crafted by hand.
The walls feature half-split bamboos decorated with foil, created using a foil stamping technique that matured in Japan during the Azuchi-Momoyama period.

The passageway that connects the two "tea rooms" represents an outdoor garden. The stone floor features a stepping-stone pattern, while the paper lanterns that line the walls are crafted in the traditional style of Azuchi-Momoyama tea rooms.

"Daimyo-cha" is the name given to the form of tea ceremony practiced by daimyo—feudal lords—in the Azuchi-Momoyama period. These daimyo frequently hosted tea ceremonies, building dedicated tea rooms to entertain high-ranking samurai. The most famous is the Golden Tea Room of Toyotomi Hideyoshi. It is this tea room that Soan is modeled after.

Soan's floor is decorated with gold leaf, the work of master craftsmen from Kanazawa. Fusing the traditional gold leaf techniques of Kanazawa with the foil-stamping techniques of the Nishijin district of Kyoto, gold leaf has been embedded into the very grain of the ash wood, drawing out its innate textures and beauty. Both subtle yet extravagant, refined and elegant, the floor appears to shimmer with light. 

The walls are adorned with Nishijin textiles patterned with flowers.

The design of Soan is inspired by the extravagant Golden Tea Room even to the cooking range hood. Champagne-gold aluminum panels embellished with a hammered finish are interspersed with stripes inspired by maki-e lacquer decoration techniques, its design a fusion of the traditional and the modern.

Taian is inspired by the simplicity and silence of wabi-cha, a style of tea ceremony particularly associated with the tea master Sen no Rikyu. 

The floor is tiled with the renowned "Sekishu gawara" tiles from Shimane Prefecture. Their smoked-silver color is in tune with the simplicity espoused by wabi-cha. 
The impressive cooking range hood is decorated with aluminum panels that have been stained silver and blackish-brown. Each of the panels has been decorated by hand with a rippled or hammered finish. The walls are adorned with Nishijin textiles patterned with pine-bark in the kumodori style, and with Korean hill cherry in the kiredori style.