| Gas Natural Building | |
|---|---|
Edificio Gas Natural | |
_01.jpg) Mare Nostrum Tower−Gas Natural Building | |
 | |
| General information | |
| Type | office skyscraper |
| Architectural style | High-tech |
| Location | Barcelona, Catalonia, Spain |
| Construction started | 2003 |
| Completed | 2005 |
| Owner | Inmobiliaria Colonial |
| Height | 86 m (282 ft) |
| Technical details | |
| Floor count | 20 |
| Design and construction | |
| Architect(s) | Enric Miralles & Benedetta Tagliabue |
The 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.
It was the headquarters building of the Spanish company Naturgy, formerly known as Gas Natural, until 2019 when the company's legal headquarters were moved to Madrid.