If you have to pay royalties, they won't be to the bar; they'll be to the bar's architect. Copyright law generally only covers expressive, rather than functional, aspects of a copyrighted work, so things like doors and walls might be okay, but architectural design is recognized as copyrightable.

In general I strongly recommend avoiding the term "intellectual property" because it conflates several different areas of law with almost totally unrelated traditions, statutes, and (in common-law countries) precedents — copyrights, patents, design patents, mask works, trademarks, trade secrets, and most alarmingly, in the EU, database rights. (Moreover, it's an extremely loaded term, like "pro-life" and "pro-choice".)