N.D. Cent. Code § 47-04-02
47-04-02. Classification of estates as to duration
47-04-02. Classification of estates as to duration
Estates in real property in respect to the duration of their enjoyment are:
1.
Estates of inheritance or perpetual estates;
2.
Estates for life;
3.
Estates for years; or
4.
Estates at will.