Abstract
Abstract: Urban heritage conservation plays a vital role in sustaining cultural identity and promoting sustainable urban development. However, most urban heritage conservation projects in Egypt, particularly in Alexandria, lack post-implementation monitoring and performance evaluation. This oversight leads to their sustainability failure under persistent environmental and socio-economic pressures. This study assesses the sustainability of conservation projects through a case study of El-Nabi Daniel Street in Alexandria.. Recognized for its historical and architectural significance, El-Nabi Daniel Street embodies the challenges and opportunities inherent in balancing heritage conservation with contemporary urban demands. The research evaluated the extent to which conservation efforts align with the principles of sustainability through the lens of a five-dimensional sustainability aspects (Urban, Economic, Social, Environmental, and Political). Data were collected from 90 diverse stakeholders via a quantitative survey using a five-point Likert scale. The results reveal a critical strategic imbalance. While the project succeeded in the Urban Aspect, specifically in Mobility (0.82) and Preservation of Urban Pattern (0.76), it failed significantly in other domains. The Environmental Aspect recorded the lowest scores, particularly in Biodiversity (0.20) and Water Management (0.28). Additionally, critical gaps were found in Financial Support (0.37) and Public-Private Initiatives (0.35). The study concludes that physical intervention alone does not guarantee sustainability. The findings emphasize the urgent need for a shift from "restoration as an event" to "conservation as a managed process." This research provides a vital framework for decision-makers to ensure the long-term viability of Alexandria’s urban heritage against accelerating urban and environmental challenges.