The Carabetta Management Co - Malden Towers apartment building has an industrial AC unit (or other large mechanical equipment) in the back of the building facing Garnet St, between the Malden Towers Park and the public parking lot off Pleasant St. This week the building turned on the unit, running at all hours, and it is very loud. I hear the noise constantly from inside my nearby apartment, particularly the higher pitched tone. It is disruptive to my comfort at home. I believe the noise is excessive and exceeds the 50 dBa allowed for nighttime noise per Municipal Code 10.04.020 "Noise Abatement; Disturbing the Peace Prohibited". From my experience, I know it is clearly audible to a person of normal hearing at a distance of one hundred feet from the source. Please test and address. Thank you.