Gas Natural Building
Gas Natural Building , also known as Mare Nostrum Tower , is an office skyscraper located in the La Barceloneta neighbourhood of the Ciutat Vella district in Barcelona , Spain . 
<triplet> Gas Natural Building <subj> Ciutat Vella <obj> located in the administrative territorial entity <subj> Spain <obj> country <triplet> La Barceloneta <subj> Ciutat Vella <obj> located in the administrative territorial entity <subj> Spain <obj> country <triplet> Ciutat Vella <subj> La Barceloneta <obj> contains administrative territorial entity <subj> Barcelona <obj> located in the administrative territorial entity <subj> Spain <obj> country <triplet> Barcelona <subj> Ciutat Vella <obj> contains administrative territorial entity <subj> Spain <obj> country