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MCPs encompasses “Infrastructure development projects (IDPs)” such as skyscrapers, mega-shopping complexes, large public transportation projects, power plants, oil and natural gas extraction projects, bridges, tunnels, seaports, large-scale sporting facilities water and dams, power supply and urban development projects. Such projects characterized by strategic importance, dynamic complexity, adaptability and extensive impacts. Such combinations make them inherently vulnerable to crises. As a developing country, Nigeria is facing some fundamental challenges that need attention before it can fully realize its economic potential due to its size, population and resources. This paper examines the socio-economic performances of MCPs in the light of sustainable development with the view to identify and assess such performances from the project professionals’ perspectives’ working in Nigeria’s built environment. The literature reviewed led to the identification of 16nr. SEP impact factors of MCPs; forms the backbone of the questionnaire. These SEP factors and their related impacts brought about by MCPs in Nigeria assessed and the results show they were significant as they aid the sustainable development of the overall country and its citizens socio-economically. These altogether shapes the overall sustainable development of a developing country like Nigeria.

Sustainable development is means to balance the needs of the present and future generations without compromise. However, achieving such a feat may be less challenging for developed countries, but it is a big challenge and more complicated for developing countries like Nigeria, located in West Africa. Nigeria’s population is about 200million and growing, which comes with its prospects, needs, and challenges such as the need for more infrastructure and industries to reduce poverty and create more employment opportunities. Other challenges include addressing housing shortages, disposal of domestic and industrial wastes, curbing industrial pollutions, providing cleaner and drinking water for domestic purposes, need for more power supply, increased food, material production, and consumptions etc. altogether, they must be within a balanced ecosystem and environmentally sustainable biodiversity within the built environment. This paper assessed and discussed the determinant factors related to sustaining sustainable development in Nigeria to offer more insight into such factors, paving ways of addressing such issues. A sequential mixed methodology was adopted in the study to collect and analyze the data on such factors. The results show that Stakeholders Awareness and Interests; Funding; Policy framework, Infrastructure project planning, and execution; corruption were among the most significant impact factors that sustained Nigeria’s built environment’s sustainable developments. Depending on the project type, such factors can promote or hinder sustainable developments in the built environment based on their levels of impacts.