Which of the following is NOT generally included in real estate?

Annual crops are typically considered personal property rather than real estate. This is because, upon harvest, the ownership of the crops is transferred, and they are not permanently affixed to the land. In contrast, trees, air rights, and mineral rights are generally classified as part of the real estate. Trees are considered a permanent part of the property, air rights pertain to the space above the land that can be sold or leased, and mineral rights involve the resources located underground, which are included in the ownership of real estate. Thus, while various components may contribute to real estate value, annual crops stand apart as personal property that can be removed and sold separately from the land.