National Institute of Development Administration or NIDA is one of several compact-sized universities located in the suburban area of Bangkok. Aiming to harmonize with the local surroundings and increase campus sustainability, we initiated the NIDA Smart Compact City (NIDA S2C). The project focuses on establishing and designing an eco-friendly campus, while enhancing urban sustainability and citizen engagement through collaborating with academics, communities, neighborhood, and local government. In our green campus, we installed smart and IoT sensors for efficient environmental management. With the awarded Smart City-Clean Energy project by the Ministry of Energy, NIDA is the only institution of a small scale to receive this distinction among Thailand's seven other smart cities. The MOU with 12 urban development companies also plays an important role in coordinating cooperation and knowledge sharing among several city development entities. The university has continued progressing to become the country's leading city university for sustainable development.