If its not a huge big coin - maybe a penny or so, it should fly right back into the building due to upward air pressure glidin up the walls of the building is stronger than the gravity pull.
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Arabella High-Rise Building was created in 1969.
High buildings are called as Skycrapers
High school drop out
What happens is the moon (and possibly the sun) pull the water more strong than not, causing a high tide.
Le Corbusier