Property management is an activity and oversight of real estate. Real estate management is a combination of both real property and resource management.
Ownership is the state or face of exclusive rights and control over property, land/real estate or intellectual property. Ownership involves multiple rights, collectively referred to as title, which may be separated and held by different parties.
Property management is the operation, control and oversight of real estate management indicates a need to be cared for, monitored and accountability given for its useful life and condition. This is much akin to the role of management in any business.