"Real property" includes any right in real property, including, but not limited to, a leasehold interest in real property. The term "real property" includes land and permanent buildings. Things which are affixed to land, or incidental or appurtenant thereto, are generally considered as part of the real estate. Land also embraces all titles, legal or equitable, perfect or imperfect, including such rights as lie in contract whether executory or executed. (CCP 17(B),481.203; CC 14, 658, 659, 660, 662)