The business in question does occupy the entire building, which does not actually have multiple addresses.

A forum thread from six years ago in which there is no clear consensus and which is in conflict with the most recent tagging guidance on the wiki is not an authoritative source.

I've fixed this specific instance in Changeset: 152216484; please do not reduce more-detailed mapping of features as areas into nodes in the future.

Thanks for making the other good contributions in this changeset and closing their related notes - happy mapping.