The government office building has the potential as a public building that serves as a "base of the town", but its potential is not utilized at present. Therefore, in this plan, we will create a "town base" that can easily pass through and accumulate regardless of business to the government offuce building by new form operation. By making a cut into a box-shaped government building and swinging it up and down around the central promenade, a groove space is created, and a "relationship that can be watched over" by the people of the city, children, and working people is born. The space with grooves born there is named “Machimizo”. For me, “Machimizo” is a playground that is watched over like an alley space in front of my parents' house, and it is the only place where I can feel the community with my neighbors even though it is a city. I will apply such