I was in Bilbao last week and I saw this building that seemed out of place with its surroundings. It looked abandoned (broken windows, graffiti) but very imposing. And it probably had a great view.
It is an elevator, by which you could reach the Parque Extebarria and the Basilica Begoña. According both to (Basque-only) Wikipedia article and various other sources it was in use until 2014 and later abandoned. It's still not functioning as of July 2017.
The exact location is shown here: Google Maps