To have a house you need materials, and systems to manage the energy and material flows (water, power, waste etc).
Pretty simple.
But what makes a property system a property system?
Here’s a few thoughts:
Ownership
There needs to be a clear understanding of where ownership sits. This get’s reflected by legal structures, but the fundamental component is ownership.
Material
The literal buildings as well as the skills needed to assemble them into something useful.
Land
An essential, but perhaps often forgotten component. Remember that land is a finite resource.
People
Perhaps most importantly, you and I. Putting people central to the system, not profit, and seeing people as connected to each other and the plant should be a priority of the system.