The Gunnan building, completed in 1991 and designed by Plantec, stands as a notable example of contemporary architecture in Tokyo's Shibuya district. Originally serving as the headquarters for Neo Pharmaceutical Industries, this structure seamlessly integrates residential and office spaces within its modernist framework. Located in the affluent Hiroo neighborhood, the building demonstrates thoughtful design principles that balance functionality with aesthetic sophistication. Its clean lines and efficient spatial planning reflect the architectural sensibilities of early 1990s Japan, making it a significant reference point for understanding commercial-residential hybrid architecture during this dynamic period of urban development.