This is one of the times I can say for sure that I know what I'm saying. A mix of improbable circumstances. The funny thing about the link you share is that th

This is one of the times I can say for sure that I know what I'm saying. A mix of improbable circumstances. The funny thing about the link you share is that the two comments that offer the real answer are the least voted. They explain why actions were called in rem (a demand related to possesions as opposed to in personam) and that real estate is refered to goods that you can't move, as opposed to furniture. Actually in Spanish real estate is "inmueble" while furniture is "mueble".