Here you go:
CASE WHEN `Link Agency ID` <> 'BKR' THEN `Link Agency ID` END
By omitting the ELSE, anything that doesn't match (not equal to BKR, so BKR) will get assigned a NULL value.
Let me know if that wasn't what you were looking for.
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that didn't seem to work, so what I'm looking for is if link agency id = BKR then show a blank value, else show whatever link agency id is