Arab House near the Temple Mount

Picture of a Hexagram on an Arab House near the Temple Mount is courtesy of "keithwills" who published it on Flickr and wrote in the caption:

The Arabs will tell you that they were the first to have posession of the temple yet here we see the star of David on one of their buildings. They built most of their area of the temple from rubble from the old temple.

It seems to me that these Stars of David, about a meter below the roof of this building, are not that old but keithwills surely chalenges the experts to explain where did these emblems come from...