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Hooray!

I assume that your Building class has text associated with it that is parsed to a double so that the howMuch comparison can be made. Correct me if wrong.

Assuming I'm correct, most...

You can create your own plain text box or dialog as you've described. I haven't done it, so I don't know exactly what is involved, but it's possible.

You might also explore the options to modify...

I recommend you tame the "big mess" by understanding what's going on. If you'd like help, ask here.

It'd be interesting to see the code behind what you've described, because I'm having trouble visualizing it, but don't bother. If you haven't heard it before, you're hearing it here now, "Swing is...

That's called a ToolTip. You can find info on how to customize those and make them appear in the Java Tutorials.