Mazaherylaghab, H.Haghi, M.Ilgın, H.Aslantamer, Ö.01. Atılım University2025-11-052025-11-0520251541-77941541-780810.1002/tal.700832-s2.0-105018737989https://doi.org/10.1002/tal.70083https://hdl.handle.net/20.500.14411/10927Spatial efficiency in Tehran's high-rise building design is shaped by a complex blend of multiple factors such as architectural and structural considerations. Tehran's innovative and flexible strategies have allowed the city to address the complexities of high-rise design considerations, resulting in the creation of some of the most progressive and sustainable tall buildings in the Middle East. However, detailed studies on space utilization in Tehran's tall towers remain scarce. This article addresses this gap by analyzing 48 case study towers, revealing key trends such as the dominance of residential functions, central core designs, prismatic forms, and the frequent use of steel rigid frame systems. The analysis revealed an average spatial efficiency of 91% in Tehran's towers, with a core-to-GFA (gross floor area) ratio of only 6%, exceeding typical efficiency ratios observed in other regions, though shaped by Tehran's specific urban and economic context. These findings promote sustainability and provide crucial insights for construction professionals, supporting the informed decision-making process for tall building projects in Tehran and other densely urbanized areas. © 2025 Elsevier B.V., All rights reserved.eninfo:eu-repo/semantics/openAccessArchitectural DesignCore-to-GFA RatioSpatial EfficiencyStructural DesignSustainable Building DesignTall BuildingsArticle