It was shortly after midnight that the woman fell from a balcony of the apartment building. She is suspected of having been pushed down.
A 45-year-old man, with whom the woman had a relationship, has been arrested on suspicion of aggravated assault.
The police state that there must have been a fight in the apartment before the woman, who is 35 years old, fell from the balcony.
It is unclear from which floor the woman was pushed, but she has not suffered any serious injuries.