A restrictive covenant that incorporates height limitations from an external standard (such as the CASA Manual of Standards) by reference imposes a present obligation on lot owners, even where the external standard does not directly apply to the land by force of law. The covenant adopts the standard as a metric, not as a source of obligation, and its operation is not conditional on the external standard becoming directly applicable. An equivocal email stating that a building height 'may be possible' subject to final levels does not induce an assumption sufficient to found an estoppel, and there is no duty to speak where parties are of equal bargaining power and the party claiming estoppel has the obligation and capacity to verify compliance with covenants on its own title.
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