Third place is defined as informal public spaces that foster social connections and community cohesion, playing a crucial role in urban environments. However, third place is often underexplored from the perspective of working women and contributions to environmental sustainability. Therefore, this study aimed to examine the spatial practices of working women in third place, focusing on SCBD (Sudirman Central Business District) Park in Jakarta. The characteristics of third place based on Oldenburg’s characteristics and other studies were evaluated in relation to environment sustainability criteria. Using a constructivist paradigm and a qualitative case study approach, data were collected through interviews with 10 working women and field observations. The results showed that third place, specifically SCBD Park supports sustainable urban practices by offering accessible, low-energy environments facilitating social interactions. Working women integrate these spaces into daily routines as social hubs, rest areas, and place to refresh appearance, reducing reliance on high-energy indoor facilities including offices or cafés. Despite being open spaces, SCBD Park as a third place can provide privacy for women through visual barriers that create semi-enclosed areas. The presence of working women in these spaces also promotes sustainable mobility, as many choose walking or public transportation over private vehicles, thereby reducing carbon emissions. In conclusion, the spatial practices of working women in third place significantly contribute to environmental sustainability by lowering energy consumption, encouraging ecofriendly commuting, and enhancing the multifunctionality of public spaces, ultimately fostering more sustainable and resilient urban environments. © 2025 Faculty of Engineering, Universitas Indonesia. All rights reserved.