A $50-$storey building is being planned. It is to be $211$ m high with a width $85$ m and depth $40$ m$.$ The building needs an air$-$ventilation system that will refresh the air throughout the building every $26$ minutes. Assume that the walls and the floor thickness reduce the overall volume of air by $160$ m$3.$

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Given that the density of air at $20$o C is $1\mathrm{.}204$ kg$/$m$3,$ can you figure out the total mass of air in the building $?$

Give your answer in metric tonnes up to $0$ decimal place. $($Watch your units$)$