This paper examines the critical role of Mega Infrastructure Projects in sustainable urban and peripheral development by presenting a Sustainable Infrastructure Serum Analysis supported by primary field research. In the Athens Metro case study, we examined the project's impact on sustainable development by analysing the opinions of the project's users. As a result, the Athens Metro serves as a case study to help us better understand sustainable infrastructure as a framework for green growth from the standpoint of society. The three pillars of sustainable development are inextricably linked. This study focuses on the social comprehension and acceptance of a Mega Infrastructure Project effects. We attempt to demonstrate the interdependence of the three pillars of sustainable development through public opinion responses to our research by developing a statistical model fed by public responses to a prototype questionnaire that we developed to support our research objectives. The study's findings highlighted the project's social acceptability and necessity by establishing a direct positive correlation between sustainability, society, the economy, and the environment from the standpoint of society.

The organization of space and working time, especially their location and geography, is a significant concern to researchers and politicians. However, in today's globalized economy and online age, the way we work and the workplace's whole location and geography are being redefined and researched. This paper investigates the current situation of co-working spaces in Greece, and the authors further analyse the case study of the Athens municipality. They examined views on new workplaces satisfaction and the benefits of the location. The research also explored the factors influencing ‘co-working spaces' satisfaction and views on the location's benefits. Finally, there is a detailed record of the areas in question throughout the territory, and they are scattered and concentrated in certain areas. Their characteristics are then explored, and policies and actions are proposed for their operation and development in the post-COVID-19 era.

Sustainability has become a fundamental priority in the global construction sector, encompassing both green buildings and mega infrastructure projects (MIPs). However, existing sustainability assessment systems typically address these two domains independently, often resulting in fragmented evaluations and missed opportunities for holistic sustainability outcomes. This paper explores the critical need for a unified sustainability assessment framework that integrates green building practices with large-scale infrastructure evaluation. Through a comparative review of leading certification systems such as LEED, BREEAM, WELL, Envision, and CEEQUAL, this study identifies the methodological gaps and overlaps that currently limit cross-scale assessments. The paper proposes a structured approach for developing interoperable sustainability indicators and joint certification processes capable of providing comprehensive, lifecycle-based evaluations. A SWOT analysis is conducted to assess the potential strengths, weaknesses, opportunities, and threats of adopting such an integrated framework. The findings demonstrate that harmonizing sustainability assessments across buildings and infrastructures can significantly enhance environmental, social, and economic performance, while reducing redundancy and improving certification efficiency. This research contributes practical insights for advancing sustainable development in complex construction projects, including mixed-use developments and large urban regeneration initiatives.