Cost model: Tall buildings | Features

Residential vs commercial
Key differences	听	听
Element	Residential	Commercial
Average floorplate (gross internal area above ground)	560-790m2	1,500-3,000m2
Wall:floor ratio (above ground)	0.50-0.70	0.32-0.63 (usually %3E0.50)
Floor:floor heights (above ground)	2.90-3.15m	3.65-4.15m
Facade strategy	Unitised curtain walling, 60:40 mix solid panels/ vision glass including openable windows	Unitised externally ventilated double wall facades (complexity varies)
Structural frame and core material selection	Frame-concrete,core-concrete	Frame-steel, core-steel or concrete (central or offset)

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