No it is not, an earlier WA building (not necessarily the earliest) was across from the Burgermaster on SR520/Northup Way. I think they meant it's the original MS building 3. As far as I know there is no 'new' building 3.

There's a new building 3 as part of the East campus redevelopment

https://maps.app.goo.gl/o4fLxGArs6GAhxgE9

The first in WA was directly adjacent to the Burgermaster on Northup. The next set of buildings was nearly directly across 520 to the south.

The title is referring to the fact that the building shown is the original Building 3. It has since been demolished, and now there's a new Building 3.

And there's finally a Building 7, which I guess could be a way to determine when an ex-ms employee worked at the main campus.

see https://devblogs.microsoft.com/oldnewthing/20080401-00/?p=22... and https://devblogs.microsoft.com/oldnewthing/20250401-00/?p=11...