Income from immovable property may be taxed in the State where the property is situated under treaty rules. Income derived by a resident of one Contracting State from immovable property situated in the other Contracting State may be taxed in the State where the property is situated, covering income from direct use, letting, or any other form of use. 'Immovable property' is defined by the law of the State where it is located and includes accessories, agriculture and forestry assets, usufruct, and rights to payments for working mineral deposits and other natural resources; ships, boats and aircraft are excluded. The provisions apply to enterprises and to independent personal services.