Dr. Mostafa Behzadfar Armanshahr Architecture & Urban Development 2008-5079 17 48 2024 12 20 Investigating the Evolution of Tehran City’s Spatial Structure and the Influence of the Pedestrian Street Development Plan on It; Using the Space Syntax Technique; Case Study: 17th Shahrivar Pedestrian Street Development Plan Investigating the Evolution of Tehran City’s Spatial Structure and the Influence of the Pedestrian Street Development Plan on It; Using the Space Syntax Technique; Case Study: 17th Shahrivar Pedestrian Street Development Plan 115 132 188636 10.22034/aaud.2024.402903.2796 FA Leila Moghimi Assistant Professor of Architecture, Faculty of Architecture and Urbanism, Soore International University, Tehran, Iran (Corresponding Author). Pirouz Hanachi Professor of Restoration and Revitalization of Historic Buildings and Fabrics, School of Architecture, College of Fine Arts, University of Tehran, Tehran, Iran. Somayeh Fadaei Nezhad Bahramjerdi Associate Professor of Restoration and Revitalization of Historic Buildings and Fabrics, School of Architecture, College of Fine Arts, University of Tehran, Tehran, Iran. Journal Article 2023 06 18 The spatial structure of Tehran City has evolved over time due to various factors, including spatial, temporal, and socioeconomic ones. To understand how changes in the city's spatial structure and new development plans, such as pedestrian street projects, have affected its historical areas, it is essential to know the city's history and its physical evolution. This study examines the evolution of Tehran's spatial structure throughout different historical periods by analyzing the degree of integrity using the Space Syntax technique. Assessing the integrity of streets at both neighborhood and supra-neighborhood scales within the historical area is crucial for their valuation and prioritization in accepting pedestrian street development plans. The study argues that implementing these plans can effectively enhance the integration and connectivity of the city’s historical structure while acknowledging that the formation of specific streets before their conversion into pedestrian streets influences their walkability. Therefore, the present study categorizes them. This research is applied, focusing on the physical and structural evolutions of Tehran City through an interpretive-historical approach. The data are analyzed through simulation and content analysis. The findings reveal that pedestrianizing 17th Shahrivar Street, as a case study, fails to preserve the integrity and coherence of the city's historical center, and undermines accessibility and integrity indicators at both neighborhood and supra-neighborhood levels. The spatial structure of Tehran City has evolved over time due to various factors, including spatial, temporal, and socioeconomic ones. To understand how changes in the city's spatial structure and new development plans, such as pedestrian street projects, have affected its historical areas, it is essential to know the city's history and its physical evolution. This study examines the evolution of Tehran's spatial structure throughout different historical periods by analyzing the degree of integrity using the Space Syntax technique. Assessing the integrity of streets at both neighborhood and supra-neighborhood scales within the historical area is crucial for their valuation and prioritization in accepting pedestrian street development plans. The study argues that implementing these plans can effectively enhance the integration and connectivity of the city’s historical structure while acknowledging that the formation of specific streets before their conversion into pedestrian streets influences their walkability. Therefore, the present study categorizes them. This research is applied, focusing on the physical and structural evolutions of Tehran City through an interpretive-historical approach. The data are analyzed through simulation and content analysis. The findings reveal that pedestrianizing 17th Shahrivar Street, as a case study, fails to preserve the integrity and coherence of the city's historical center, and undermines accessibility and integrity indicators at both neighborhood and supra-neighborhood levels. https://www.armanshahrjournal.com/article_188636_9dfc2f6fa7e8f9e9df03ec5050143182.pdf