This Opinion Paper was developed in a context in which there is renewed interest in vacant lots and buildings. For the last several years, resident groups, associations and not-for-profit organizations have been created with the purpose of revitalizing and beautifying them, and occupying them during a temporary period. By showing an interest in these spaces, young Montrealers are reaffirming their sense of belonging to their city. By committing themselves to these spaces, youth are making a commitment to their city, participating with all their creativity. This Opinion Paper was written and designed by Entremise for the Conseil jeunesse de Montréal.