landowner; landholder
A person or entity that owns land. Neutral, formal term used in legal, real estate, and everyday contexts.
He is the landowner of this area.
You cannot enter without the landowner's permission.
地主 often implies a landlord who rents out land, while 土地所有者 is a broader, more neutral term for anyone who owns land.
Compound of 土地 (land) + 所有者 (owner).