What is the term for projects that are owned by or controlled by a single entity on a common site?

The term for projects that are owned by or controlled by a single entity on a common site is "Campus." A campus typically refers to a collection of buildings and facilities that are unified under a single ownership or management structure, such as a university campus or a corporate campus. This term highlights the idea of numerous related facilities existing within a specified area, often sharing resources and providing a cohesive setting for activities.

The other options refer to different concepts. A "Community Zone" usually implies a designated area within a larger community that may focus on collective activities or functions, but it does not specifically denote ownership by a single entity. "Public Domain" implies land or property that is open and accessible to the public and not owned by any one entity. A "Shared Facility" refers to a space or resource that is utilized by multiple parties, which fundamentally differs in ownership and operational control compared to a campus.