The quality of our built environment affects our happiness, well-being, and mental health through conditions of loneliness and isolation.Ottawa's urban realm fosters many 'devices of isolation' throughout its landscape, as displayed through its materiality, privatized living, and lack of engaging public space at the street level. Research has found these conditions of social isolation among urban residents negatively affect one's health and well-being. However, cities still lack consideration for the quality and quantity of their social spaces. In order to provide opportunities for social interaction to improve mental health conditions among residents and reinforce a sense of human-centered design, a reconsideration of Ottawa's public and private-public-facing space is needed. In response, this thesis proposes five calls to action through a network of public space interventions that reimagine existing plazas in downtown Ottawa, and question how we can use our cities to foster human connection to reduce urban isolation and subsequent mental health conditions.iii ACKNOWLEDGEMENTS Firstly, I would like to sincerely thank my thesis advisor Dr. Federica Goffi for her thoughtful guidance, rich and extensive knowledge, and constant support throughout this challenging process. I am grateful to have learned from you and to have been pushed by you in new ways.To my family and friends for your constant support and encouragement throughout my entire academic journey -I am forever grateful for all the ways you have unknowingly contributed to my growth. To my best friend, Nina, for always answering my panicked facetime calls at all hours of the day and providing extremely thorough and rigorous comments, you are truly a brilliant soul.Lastly, I would like to thank my thesis group, Tavleen, Argel, and Dana, for their invaluable feedback, contributions, ideas, and constant encouragement in times of self-doubt. I am so glad to have had you guys by my side throughout this journey. You all have truly made this a memorable experience. Thank you.