In Spanish we use the preposition para (not por) when we want to express a surprising fact in relation to a general statement.
Have a look and listen to these examples:
Para ser adolescente, ella es bastante responsable.For a teenager, she is quite responsible.
Here, the general statement is that all teenagers are irresponsible, however she is an exception.
Para una universidad tan prestigiosa, los resultados no han sido muy buenos este año.For such a prestigious university, the results haven't been very good this year.
Here, the surprising fact is that the results have been bad, despite being considered generally as a very good university.
Para una universidad tan prestigiosa, los resultados no han sido muy buenos este año.For such a prestigious university, the results haven't been very good this year. Para ser adolescente, ella es bastante responsable.For a teenager, she is quite responsible. 
