In The Sandbox, Toronto’s Exchange Tower at 130 King St. W. is reimagined as a vibrant hub for family living, learning, and play. Honouring the site’s commercial history, the 36-story office tower’s existing connection to Toronto’s PATH network and its amenities is amplified and celebrated through a revitalized connection to the street and the integration of a family-focused residential program. The office-to-residential conversion takes advantage of the tower’s original cruciform form, carving communal “sandboxes” into the volume to create shared outdoor spaces and bring natural light into the residences. This design results in a variety of vertical "neighbourhoods," reimagining high-rise urban living. A sequence of public spaces, from the street to the PATH and exterior circulation up to the rooftop plaza, incorporates recycled granite and glass, paying homage to the materials that define both the existing building and its neighbours in the financial district. The plaza thus becomes a multi-level layered space that can accommodate many activities, including performances or even pop-up markets that connect to the path below. Overall, the Sandbox is an exciting prototype for family living that welcomes new people to live and grow in cities like Toronto.