The inner governance of condominiums profoundly matters for understanding urban governance and life but has so far been neglected in urban studies. This article examines its relation to development and suggests how several overlooked institutional processes, forms of knowledge and corresponding agents render the condominium possible through relations of governance. These multiple, reinforcing institutional elements -juridification, financialisation and commodificationare constituents of an urban governmental process we refer to as 'condo-isation'. Drawing on interviews with condominium owners and condominium industry representatives and on related qualitative data in Toronto, Canada, we illustrate overlap between condominium development and inner condo governance and elaborate these institutional processes, agents and knowledges. We conclude by discussing implications of our analysis for existing concepts and future urban studies research.