Castle Dragonheart Is a Small Business?

I built a castle, that took a good three-four days to get right. I made one version of it a restaurant and then made a few tweaks to it and turned it into a private residence. This was quite some time ago, back when I was still playing a previous, now defunct save.  Long before H & B came out. (We were still on the old forums, to give you a clue as to how long ago.) So, you can imagine my surprise, when I dusted it off and took it out of my gallery to download it into my current save, to find it was designated a Small Business. 🤔

I need help in removing this designation.  I plan on using it as a Vacation Rental, for my Rock Star and his family, while he's on a World Tour.  He's not the original owner and I am at a loss as to how to remove the small business trait.

I've been careful to add whatever I think this family may need while they stay here, knowing full well that once they rent this vacation rental, there is no access to Build/Buy mode. Without that access, there is no way for me to make a change in lot Traits.

If anyone knows how I might remove the small business icon, I would appreciate a step-by-step. Please and thank you, in advance. And please don't suggest I rebuild it. I'm uncertain I have the heart for it.