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Traditionally, CC&Rs are changed only with permission of the Court, which has to agree that the relevant covenant no longer applies and is outdated for the neighborhood.
However, more and more CC&Rs verbiage includes that CC&Rs may be changed by the HOA, with 67% of total voting power standard - this is what you seem to have.
What you have to do is look at the verbiage. That 67% - is it by the BOARD or ALL MEMBERS? If by the Board only, then if the Board gets to 67% it can be changed. If it is by ALL MEMBERS, then majority of all owners, then it has to be 67% of all owners.
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