What if the Kingsbridge Armory itself became a city? What kind of city could it be? How could this city integrate into existing infrastructure and help support the wellbeing of its community members? Our proposal creates a city within the Kingsbridge Armory that can provide inspiration, enlightenment and education for community residents and subtly affect their lifestyle. They can get some thinking about education and health, and gain totally new cultural and entertainment experience here. From the precedent of how urban space shapes people’s behavior and mode of thinking, we can see that in Diocletian’s Palace, once a fortification system, various walkable spaces were formed due to the retained city walls, gates, and streets. People can wander aimlessly to gain leisure, entertainment and even inspiration. Therefore, we realize that the void spaces of the city really belong to the public and provide the possibility for various events to occur, which is an important part of stimulating urban vitality. Our proposal introduces a road system that follows the Armory’s original grid. From there, internal city blocks are designed to create space. Over time the city can be redivided into new plots of large or small size to meet the needs of different investors. At the same time, we pursue the use of lighter, sustainable and easily buildable materials to create our city.