[rsynnott]

I think there are at least two separate issues here; some countries have health and safety laws requiring natural light, while others require natural light in newly-built offices (as a condition of planning etc). Can you build an office in London these days that doesn't have natural light in the main spaces? I'd be sceptical.

[dithering]

Old building. Managed offices, completely gutted internally last year. I don't know if that wound count as new build. Probably not.

[rsynnott]

No, definitely not. You get away with all sorts of things with a sufficiently old building.