I'll add a few bits. Commercial leases are typically "triple net" so taxes are passed pretty much directly through to tenants and land lords don't need to worry too much about them. A very visible part of the "dead downtown" effect is due to small businesses that have terrible margins, high fixed costs (including rent), and don't survive losing 20% of their customer base. And finally, anyone paying attention saw that Seattle core downtown is a highly concentrated bet on office rental to the exclusion of almost any other use of space or reason to go there.

A few years back I did an art installation in one of the storefronts at the 2+U building and in the process got to study up on some of the issues and talk to a few people, the general theme was that everyone had a vested interest in focusing on possible causes that were external and fixable within a short time. I don't think that's reality.