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can be a symbol of national recognition. One of the recent trend of tall building development is multi-function. Multi-functional
tall buildings have been developed to maximize land use and minimize real estate market risk. The attempt to combine more
than one major function in a building or complex presents the designer with several problems. Each function has different
planning considerations for optimum and habitable space. Due to the inter-related functional requirements within a building, one
change can affect many other factors that must be considered when developing a project.
Much has been researched regarding planning factors for tall buildings. These research presented only the analyzed planning
factors by statistics with built tall buildings in the world. However, there are few references available that deal with the
appropriate building volume and planning factors of multi-function tall buildings actually designed with different total gross area
and functional gross area ratio. The purpose of this study was to suggest the distributions of the appropriate building volume
and planning factors by changing total gross area and functional gross area ratio. The result of this research will be used as
important design guideline in preliminary design phase of multi-function tall building development.