Creation of the Digital Data Base of the active property titles of the urban centres Land Registries & supporting activities for the Attica Municipalities: Agioi Anargiroi, Ano Liosia, Aspropirgos, Acharnes, Zefyri, Thrakomakedones, Ilio, Kamatero, Mandra, Petroupolis, Fili, Chaidari and Krioneri