The facades of newly built Palestinian houses are usually made of limestone and contain references to old styles of building (e.g. arches). This is requiered by municipal law (in Jerusalem, Bethlehem and other areas).
As visible in the aperture, not the natural stones are supporting the weight of the building, but concrete walls.
The house is first built as a solely concrete structure, then being covered with a thin layer of natural Palestinian limestone to make the building look like it had natural stone walls (which obviously would be very expensive). The small wooden pieces sticking out in between the slabs create a gap between them to make the cladding more realistic.