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All answers having "___ Building" as clue:

3 Character Answers:

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AIL

EWE

RCA



4 Character Answers:

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ACHE

AMES

CODE

GLEE



5 Character Answers:

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BISON



6 Character Answers:

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DANGLE

REVOLT

SINGER



7 Character Answers:

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BALLOON

EDIFICE

OCTAGON



8 Character Answers:

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ERECTING

ERECTION

HELMSLEY



9 Character Answers:

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STRUCTURE



12 Character Answers:

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CONSTRUCTION

GROUPCAPTAIN