Just curious, why would there be surveillance? Operating a business out of a house is a bylaw infraction. Big whoop. No LE involvement, seriously. Now, if there were illegals being held as sex slaves, or minors, sure. Then LE is there.
Is some bylaw enforcement officer going to bust down the door and slap you in cuffs for getting a massage in an unlicensed venue?
As to the "incident" at Ness, that's different. I believe there was an incident with a customer accosting a teenage girl on his way out, getting the locals uptight, and rightfully so. BUt as to what goes on inside, shouldn't be an issue.
That location obviously has a valid business permit, so they can't shut them down for that. As far as I see it, unless someone admits to having sex on the premises, (which to my knowledge is not happening there) which could give them probable cause to bust the door down to try catching patrons in the act, pretty much a non starter.
As for any lists they might compile, for what purpose? Unless someone inside lies about what is happening, and actually knows your name or license number, what is there to be concerned about?
I'm no lawyer, but if the police published a list of people going to a legitimate business, or even an illegitimate business, and insinuating that something illicit happened without any actual proof, man, there would be lawsuits.
Pulling a few guys over and putting a scare into them is probably the worst they can/will do. Even that is pretty bold, I'm not sure I'd answer any questions. Maybe a "Yes, officer, I availed myself of their fine hospitality and had a lovely relaxing massage. You should try it, you seem tense. No, I wasn't offered any illegal acts, nor am I aware of any taking place. Just had a massage. Is that illegal? No? OK, thanks, I have things to do. Buh Bye"