In granting any variance, the board of appeals may prescribe appropriate conditions and safeguards in conformity with this article. Violation of such conditions and safeguards, when made a part of the terms under which the exception is granted, shall be deemed a violation of this article. The board of appeals shall prescribe a time limit within which the action for which the exception is required shall be begun or completed, or both. Failure to begin or complete, or both, such action within the time limit set shall void the exception.
(2000 Code, sec. 15-77)