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Article A Comprehensive Study of Space Efficiency in Tall Buildings: The Australian Perspective(Kauno Technologijos Universitetas, 2025) Ilgın, H.; Aslantamer, Ö.Spatial efficiency in Australian towers is shaped by a multifaceted interaction of many parameters such as architectural and structural considerations. However, there are no comprehensive studies available on space utilization in Australian high-rise towers. The article addresses this gap by investigating 32 case studies. This study aims to investigate how contemporary Australian tall buildings achieve spatial efficiency by analyzing the relationship between architectural and structural parameters and internal usable area ratios. Key findings: residential function, centrally-located core layouts, and prismatic arrangements are the most widespread trends; concrete is the favored construction material, with the shear-walled frame system being the most commonly used structural system; average space efficiency is 82%, with a core-to-GFA ratio of 16%. The paper offers valuable understandings for construction experts to inform design decisions in high-rise construction projects within the Australian context. © 2025, Kauno Technologijos Universitetas. All rights reserved.Article Evaluating Space Efficiency Practices in Tehran's High-Rise Buildings: A Structural and Architectural Perspective(Wiley, 2025) Mazaherylaghab, Hamed; Haghi, Marzieh; Ilgin, Huseyin Emre; Aslantamer, Ozlem NurSpatial 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.
