Hello sabres

The right term is "usufruto". The basic idea to retain, and I'm not a lawyer, is that person A as the right, for example, to use a piece of land for building or planting trees, for a determined period of time, but the land doesn't belong to her.

An example is the Câmara giving the right of "usufruto" for 20 years to a private company to build on a plot of land. After the 20 years, the building will go the Câmara and during all the time the owner of the land is the Câmara.