Re: @Khaptain - New York or Los Angeles
No, it's worse than that and that's why this is impossible.
The "noise signature" of every studio changes over time. The technique is useful to confirm whether or not a recording was made in one take or whether it's been tampered with, no more, no less.
- Eg if the background hum has "jumps" in it, then a segment was either cut out or cut in. If the background hum is missing, then it's probably been tampered with.
It's listening for frequency shifts as the load changes on the local substation. Those changes are very chaotic, and quite random - the HVAC might be merely chaotic given a known outside temperature range, but the lift movements really are random!
A given florry ballast might whine differently to another, but again, that whine will change as the supply voltage varies and the whine pattern will change as the lamp and ballast ages, and significantly when the lamp is changed.