what is the definition of livable space in a residential home ?

Question Details: My home is listed for $584,900 in Grand Bay, AL. There is contention that my 4th bedroom/multipurpose room (21'x18') is not livable space yet there is a full stair case leading up to it, it has a full bath, heated, air conditioned with separate thermostat, closet. This was not an add on but part of the Buster McMullen design home. Stairs however are accessed from the garage. Is this space considered "livable space" and should be counted as part of the overall square footage of the home ?

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