Does the owner mean the owner of all rooms in a building or the owner of one room?

The owner refers to the owner of the house, not the owner of the building. For the whole community, the owner refers to the owner of the property. Owners can be natural persons, legal persons and other organizations, domestic citizens or organizations, and foreign citizens or organizations. Property is essentially the same as the owner in the building. Refers to the property (property) owner. The renter is not the owner.

Customer/owner. Investors of construction projects or independent legal persons specially established by investors for construction projects. The owner can be the original sponsor of the project, or a project legal person company jointly established by the sponsor and other investors; During the project warranty period, the owners may be replaced by the owners' committee (composed of buyers or small buyers who have obtained the project property rights, also known as owners' corporations abroad). In the traditional management system of capital construction investment in China, the owner is also called the "construction unit".