But overall a building wall is pretty effective at shielding from that kind of noise. I’d very much prefer a quiet white noise from the racks in the above unit

But overall a building wall is pretty effective at shielding from that kind of noise. I’d very much prefer a quiet white noise from the racks in the above unit than someone arguing at 3am or a stupid toddler screaming. You can easily tune out “stable” noise like the one produced by fans, but you can’t for irregular noise like people talking or someone dropping heavy stuff at night.