Crossword puzzle clue "part of a kid's building set"

Part of a kid's building set

Japanese island where "The Karate Kid Part II" is set

Basic building block of basic building blocks

Building block of a building block

___ Building, company headquarters erected in 1908 in New York City, at the time the tallest building in the world

Building at a kid's party, briefly

Kid's building block

Kid going nuts with building blocks?