You can actually have as many locations as you want with the same IP addresses as long as they don't need to communicate between each other. If Location A needs to communicate with Location B or C, then you've got a problem; to be specific, it's what we call a "routing problem." Packets between networks won't be able to find their way to their correct destination because each location has the same addressing scheme.
Generally, when we design a network, we follow some guidelines and rules to ensure things will work with the least amount of possible problems. A fundamental rule in network design is to ensure we don't have overlapping networks, that is, each location must be unique and not overlap with another.
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