I heard this one too - our strata council was discussing adding cameras to the complex to back up the existing "Area Under Video Surveillance" signs, and the property manager brought up a similar version of this story, although in this case, the story was that the woman was waving at the dummy camera under the assumption someone would be watching and be able to send help.
Which raises a whole other issue: the ASSUMPTION that someone is monitoring cameras in realtime, rather than the cameras just recording.
Anyway, don't know if I've ever seen anything to verify these stories. Snopes appears to have nothing at all related to this concept.
Google isn't much more helpful - I came up with three camera/rape/lawsuit stories, but one involved a security guard using the systems to his advantage to commit assaults, one was a supposed victim claiming an overall lack of security (guards, cameras, public "blue light" phones, etc.) on a college campus, and the third was a Chicago woman suing the CTA because SOME train stations had less security than others (further details are blocked by a paywall).
I did find this article discussing the issue, and it raises the same scenario I mentioned above, stating it to be a real event, but provides no attribution or proof. Actually, the "article" appears to be alternating sides of a debate on the issue, all run together, but it suggests several cases that could be found in a Westlaw search... someone then comments on the article with:
I’ve searched Westlaw (all state and federal cases) and have been unable to find a case involving Sears or Sheraton or any of the “dozens of cases on the records”. Could you please provide me w/ a few cites?
Something tells me this one can be chalked up to urban legend. The story (or several versions of it) appear to be well-circulated, but again, there doesn't seem to be anything verifiable.