Definition of "Building" :

noun: the act of constructing something

"His hobby was the building of boats."

noun: the commercial activity involved in repairing old structures or constructing new ones

"Workers in the building trades."

noun: a structure that has a roof and walls and stands more or less permanently in one place

"There was a three-story building on the corner."

noun: the occupants of a building

"The entire building complained about the noise."