high frequency intermittent noise

I have a noise issue that is intermittent. Here is what the noise sounds like:

https://clyp.it/4b233bmm

Here is what I know so far:

The sound affects all components and is compounded if all components are turned on. I have turned off my preamp, phono preamp, leaving just my mono blocks on, and the noise still appears.
I have turned off everything and unplugged everything in the house including my dimmer switch, and the noise still appears.
I have a pair of pro-audio monitors, self powered with class AB amps, and when I plug those into the same outlet, I hear the same noise coming through the pro-audio monitor. So this rules out my big system.
The noise is primarily during the day and goes into the evenings, weekends too, early mornings it does not appear.
I live in a pre-war mid-rise building. I have no ground, I'm using a Nordost QKore grounding system. This did reduce the noise floor quite a bit, but has no affect on this intermittent noise.
I have a cell phone tower directly across the street from my building in Manhattan.
Looking at a real time analyzer, I see peak at 2kHz when the noise appears.

james196911-12-2017 2:30am

james1969 OP Details Discussions Posts This discussion Message User 347 posts 11-13-2017 at 04:49pm Copy Comment URL Report Comment Edit Delete Actually the new hot spot is Hudson Yards, that is where new construction is happening. But I hear you, our infrastructure is falling apart.
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james1969 OP Details Discussions Posts This discussion Message User 347 posts 11-13-2017 at 06:15pm Copy Comment URL Report Comment Edit Delete @jea48 Funny you should mention socket outlets, I just changed my socket outlet from a generic to a Furutech outlet (audiophile brand). When I opened up the original socket, there were only 2 connections made with no ground. That is how I know there is no ground. I looked in the socket for a ground wire and did not find one, so when I swapped out the outlets, I simply mirrored the previous installation - no ground wire to connect.
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james1969 OP Details Discussions Posts This discussion Message User 347 posts 11-13-2017 at 06:47pm Copy Comment URL Report Comment Edit Delete @jea48 Thank you for all your expertise. I will pick up that receptacle tester and check it out.