Sustainability is crucial in the design and management of residential complexes, as assessing the sustainability of them can contribute to improving the quality of life for residents while minimizing the environmental impact. Despite its importance, numerous challenges affect the sustainability of residential complexes, such as unsustainable urban planning, the cost of environmental technology, consumer culture, social and cultural challenges, as well as waste management and pollution.This research evaluates the extent to which residential complexes can achieve long-term sustainability, in terms of environmental sustainability. This requires a comprehensive analysis of various aspects and indicators such as the availability of sustainable design, appropriate infrastructure, energy and water efficiency in buildings, in addition to the availability of green spaces, and access to sustainable transportation modes. They all aim to improve the quality of life for residents and minimize the negative environmental impact of buildings.In evaluating the current situation of residential complexes, the application of the LEED scale with its five indicators (energy, water, materials and resources, indoor environmental quality, site selection) is immensely useful. In this research, this scale is applied to a selected residential complex in the Bismayah City in Baghdad, Iraq. It utilizes a descriptive analytical approach for the selected complex. It also ascertains residents' opinions, to assess the reality of sustainability in the Bismayah residential city.The paper thus highlights the gaps, and proposes planning and design treatments to achieve integrated environmental sustainability. The findings indicate a widespread consensus regarding the significance of elements associated with intelligent location and connectivity, neighborhood design, green infrastructure and architectural aspects, and innovative practices in neighborhood development. They manifest at differing degrees of neutrality and reservations, thereby reflecting a nuanced perspective on these facets of urban planning.