Abstract: The concept of "shared development" promotes space sharing through planning interventions. While empirical studies commonly suggest that collaborative planning leads to positive outcomes in space sharing, practical experiences demonstrate that independent efforts can also yield satisfactory results, and collaborative endeavors may fail to achieve sharing goals. The effectiveness of collaborative planning mechanisms for achieving space sharing remains underexplored in the existing scholarship. Through examining 175 sites selected in the Community Football Fields Plan in Guangzhou, the paper explores the effectiveness of space sharing through collaborative planning within the same institutional framework. Based on survey data on participatory processes and implementation results, a preliminary logistic regression model is used to quantitatively assess the relationships between the strength of participatory mechanisms, relative effectiveness, and boundary of space sharing achieved through collaborative planning. The findings support the hypothesis that as collaborative planning becomes more comprehensive, the likelihood of establishing stable and enduring space sharing significantly improves. Notably, the P-value and OR-value of collaborative efforts levels indicates that collaboration can effectively address various challenges, such as land-use right constraints and discrepancies between current situations and land-use goals. Additionally, the study notes that external factors, represented by subsequent events, can influence and even overturn outcomes achieved through collaborative efforts. The study provides new theoretical inspirations and empirical support for detailed planning and implementation in the era of urban regeneration.