Crossword Puzzle Building blocks, e.g.

Clue: Building blocks, e.g.

Elemental building blocks (ATOMS with 5 letters)
National Gallery East Building designer (PEI with 3 letters)
Genetic building blocks (RNA with 3 letters)
Getaway that may include team-building exercises (EMPLOYEERETREAT with 15 letters)
Early building gear (TINKERTOYS with 10 letters)
Building blocks (e.g. ABCS with 4 letters)
Kindergarten building blocks (ABCS with 4 letters)
Good-sized building site (ACRE with 4 letters)
Expand, as a building (ADDTO with 5 letters)
Building extension (e.g. ANNEX with 5 letters)