The incident occurred in Malmö when the woman responded to an ad for the rental property. However, she got a shock when the landlord told her he expected sexual favours if she was to boost her chances of landing the apartment.
He added in an email to the potential tenant that he was keen to meet her and that he expected her to perform sex acts on him both before and even after she moved into the apartment.
"It's about the demands for sexual favours both before she got permission to rent the flat and then continued demands for the duration of time that she would live there," Linda Pleym, information officer of the Malmö police told local newspaper Skånska Dagbladet.
Following the sexual request by the landlord the woman declined the chance to meet the man and reported the matter to the police instead.
The police have since classified the incident as sexual molestation and blackmail.
It remains unclear if the man made similar demands to other people who were interested in the flat with police urging anybody else who may have got such a request to come forward.