My best candidate right now is a form of Cestrum x cultum--probably not the showier 'Cretan Purple'.

I thought perhaps a variety of Jasmine but giving a second look Tug I think you are correct as the leaves give it away.

Jjulio, do you know any of the history of this plant? I.e., was it a volunteer seedling, or bought from a nursery, and the label lost? You can answer by writing in the "Add comment" box, as if you were answering your own question. Everyone who commented on your question will be automatically notified.