Immatsu is a distinguished commercial dining establishment located in Kashiwa-cho, Nagaoka, Niigata Prefecture. Completed in 1978, this refined ryotei exemplifies the architectural sensibilities of the late 1970s. Designed by the renowned Cho Architectural Design Office, the building seamlessly integrates traditional Japanese aesthetic principles with contemporary design practices. The structure reflects the period's commitment to creating sophisticated culinary spaces that honor cultural heritage while embracing modern functionality. Its architectural composition demonstrates careful attention to spatial organization and material selection, making it a noteworthy example of commercial architecture from this era in Nagaoka's cultural landscape.