* Why Lookup on Account to Global Address? * An Account can reference a single default Global Address via a lookup field, allowing multiple Accounts to share the same address. * This is more efficient than the reverse (lookup on Global Address to Account), as Global Address is the parent in this relationship. * Avoiding Master-Detail: * Lookup relationships provide flexibility in this use case since Accounts and Global Addresses have independent lifecycles. Example:Create a custom lookup field on Account referencing the Global Address object.