Estates of inheritance and for life are called estates of freehold. Estates for years are chattels real. Estates at will are chattel interests, but are not liable as such to sale on execution.
N.D. Cent. Code § 47-04-03
Estates - Classification and definition
Official source: North Dakota Legislative Branch. Reproduced from public-domain North Dakota statutes; confirm against the official source for the current text. Not legal advice.