Ilgın, H.Aslantamer, Ö.2025-12-052025-12-0520252029-99902335-200010.5755/j01.sace.38.2.411122-s2.0-105020479432https://doi.org/10.5755/j01.sace.38.2.41112https://hdl.handle.net/20.500.14411/10982Spatial 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.eninfo:eu-repo/semantics/openAccessArchitectural ConsiderationsAustraliaSpace EfficiencyStructural ConsiderationsTall BuildingsArticle