San Francisco, CA Open About 1 year

Noise Issue

There is a high pitched ringing noise coming from 140 or 128 Hawthorne St. I live across the street on the 9th floor and can hear the ringing. Sometimes it’s so loud I can’t open my windows for fresh air. There are time when it is quieter or off. I do not know its pattern but it started a few months ago. Please put a stop to it. Thank you.