San Francisco, CA Open About 2 months

Noise Issue

My multi-unit highrise apartment building has a constant 63Hz noise in my unit that is higher than 45dB - this is present even at night time after hours. It is also more easy to hear at night. With all the windows and doors closed, the electrical panel turned off, I have tried using soundproof curtains and soundproof paneling - and the noise is both present and measureable to be more than 35dB at all times.