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Floors can be weird; I’m not sure how you’d handle a hotel skipping the 13th floor, for instance. Also, are floors 0 indexes or 1 indexed? It therefore probably shouldn’t be built into the protocol.

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Or it should be built into the protocol and specify a specific ruleset -- if a country/building follows another, it's up to the user to translate.

In some places it can be -1 or 2 indexed so that a building can have more floors than legally specified.

Also some buildings could have been added to after building and a basement turned into a living area, so -1.

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