The ACCOMUN project is a residential ecosystem at the forefront of contemporary architecture that, considering economic, cultural, and political conditions at different periods, advances in generating sustainable and adaptable solutions. The ACCOMUN project’s design is based on a clear understanding of decision-making establishments in the construction process. This approach reduces excessive dependencies on initial decisions and aims to increase the beneficial factors for both residents and builders. obviously, The best buildings are those with an adaptable performance, compliant use standards, and the most resilient towards changing life- style over time. The ACCOMUN buildings offer the possibility of different forms of shared ownership and introduce a new concept of “community”. The project centers on creating “interstitial spaces” within the building to enhance social interactions and foster a sense of community while preserving the quality of living and sustainability of the building ecosystem. These interstitial spaces, such as communal areas, waiting spaces, elevators, and stairways, serve as a link between private and public spaces and ultimately connect the building to the city. These spaces are designed to be both physically and socially functional, to create a more livable and sustainable environment Due to the government’s control of power and a cultural-social is- sue among the people of Iran, the public sphere in the city is under the ideological control of the government. To combat this, we have incorporated some daily social activities of ACCOMUN residents into the interstitial spaces project and aim to create new semi-private and semi-public spaces in daily life within the ACCOMUN building. there- fore, the middle sphere and public life in the ACCOMUN building are ignored interventions that shape the project, making it an architectural resistance against the uncertain economy and ideological imposition on urban lifestyle in Tehran today.