Highrise -Stairs Street” is to exploit the stone step street to the vertical dimension of a highrise. Step streets is a characteristic Hong Kong streetscape grown from the hilly typography, forming lively public freespaces with diversity and changing latitude. Highrises, despite stretching a large vertical dimension, are composed of isolated layers of mono and private experience. We propose a stair street winding up 200m high, to inject live and to utilize the highrise’s vertical dimension to heighten the stair street experience. A city’s essential elements: neighborhoods, plazas, gardens, communities, nature are represented and re-organized vertically into a high-rise structure, to continue the city’s freespace in another axis.