I suspect that alongside the obvious reasons (inflexible management styles, micromanagement, etc.) always discussed, this is a major driver: ongoing spend on office buildings needs to be justified, and is probably very difficult to get out of - e.g. long-term building projects, or ownership of buildings which would be difficult (or a big loss) to resell, or long-term leases signed when obviously the offices would be needed for decades, or senior leaders feeling personally invested in particular building projects, etc.