is a private building. And it is forbidden to go inside the building if you don’t have a legal access to the house. It is also forbidden a dron. But you can make fotos from outside. If you want to stay inside or you want to make a professional shooting you have to contact the administracion.
To visit the building from outside you can make a walk behind the fence from the house. Behind the top part from the building you have an outside free public parking. In the foto gallery you can go in touch with that place.