Japanese House II is a private villa located on Phra Tamnak Hill in Pattaya, Thailand, approximately 150 meters from the coastline. Designed by architect Mario Kleff, the residence explores the relationship between architecture and structure through a restrained palette of exposed concrete and long-span structural elements.

The house is built on an 800 m² plot and is organized across three levels connected by an internal elevator. A basement level accommodates parking, storage, and building systems, while the main residential floors contain five bedrooms, nine bathrooms, and a sequence of living spaces that extend toward outdoor terraces and a swimming pool. The upper floor forms the social core of the residence, combining living, dining, and kitchen areas in an open spatial arrangement.

The architectural concept is defined by a series of reinforced-concrete structural walls and elongated beams that shape both the structural system and the spatial organization of the house. Large monolithic concrete surfaces and minimal exterior openings establish a sense of privacy and protection, while internal courtyards and terraces introduce light and ventilation into the interior.

Constructed using high-strength concrete and structural steel reinforcement, the villa reflects a brutalist architectural approach in which structure becomes the primary architectural expression. Interior finishes combine the raw materiality of exposed concrete with contemporary elements and subtle Thai influences defined by the homeowner.

Japanese House II received an Honorable Mention at the 2023 LIV Hospitality Design Awards, recognizing the project’s distinctive architectural language and structural clarity.