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I think you're looking for the movie "Sliver" with Sharon Stone and Billy Baldwin. She thinks they met by accident, but she finds out later that it was planned. Near the end, after seeing all of the monitors he has (showing views from the cameras he's put inside the apartments) she suspects Baldwin is also the attacker. I'm sure there's a trope in here for the ending. (Where the victim attacks the perceived perp, when that very person could be helping to fight off the real perp).

One disjointed plot, but probably two separate movies. Full colour, probably mid to late 90s era.
A woman moves into a new apartment in a relatively up market area of a city. As a housewarming gift, she's given a telescope which she uses to spy on people from her window. The landlord of the place spies on his tenants using cameras. The woman's in a lift one day with the landlord and a young girl and her mother. The young girl mentions that her father beats her but her mother tells her to ignore her. The landlord mentions that it's true and reveals his video setup behind a secret door. The woman locks him out, and then I forget how it ends.
Where it gets disjointed though is, I can't remember if she had a boyfriend or not at the start. In this possible second film/ending to the first, she has a boyfriend who's killed by the landlord while she's out jogging. She thinks he's left her and looks around for him, and enters a duct/attic by removing the screws on a worn brass plate. She enters an abandoned side of the building where a deformed person who attacks her. Can't remember how that ended either....
Sketchy details, I know. Any help would be much appreciated.