What is an Existing Use Rights? Definition or Meaning

‘Existing Use Rights’ definition:

The established use of the land that has commenced with consent; however, it may have been prohibited by changes in a new LEP. When a property enjoys the benefit of existing use rights, it can only be modified to a minor way and any increase in floor space must only be minimal and may require consent. In addition, there cannot be an intensification of the land use.
Any buildings cannot be demolished and rebuilt without consent.
Should an established use cease for 12 months or more, that use may be considered abandoned. If there is conjecture to the continuation of a use, you may be required to submit supporting documentation such as receipts and written documents relating to the occupancy and use of the site.