This might be a naive question but what's to stop a company from telling a city or municipality that they meet the percentage? Not like there's any way the city can verify.
I suppose parking lot occupancy would give it away for the big businesses that have their own parking. One could probably cheat this by getting car fleet purchasing power and storing vehicles in said lots but I think that may be obvious and getting caught would be quite the scandal.
Once again, its no ones job to enforce this much less inspect parking lots. You could go all “well they could mine satellite data” and sure they could but they could do that for a lot of issues that they don’t currently. Like how you can see that many homes are hoarder houses/illegal dumps just from a cursory panning of satellite imagery and the city doesn’t do anything.
If you have been in the SV area too long, it is easy to forget this but in most places most companies strive to obey the law. Because social compact and a predictable regime of how people behave and all that.
* use of public transit
* use of roads / traffic measuring
* measuring counts of pedestrians
* anecdotes and actual data about the performance of businesses near offices
* water, electricity, and other utility metrics
* parking tax rates
These are just the ones I can think of off the top of my head, and I am sure there are many others that are not obvious.
Those are just the things off the top of my head.