2.1.2. Private property is not some natural law, if you look back in history, there was none. Land used to be held in common by people who lived on it and used it. In the 18th century those lands were taken and given to single owners, it's known as the enclosure movement that happened in Britain.
Sunbeam City is a Libertarian Socialist solarpunk instance. It is ran democratically by a cooperative of like-minded individuals.