Alberto Campo Baeza
Offices for The Junta de Castilla y León
Notice the detailing of the windows and how the mullions align with the paving stones within a perfect grid. It's an exhaustive attention to precision you just don't commonly see. It takes considerable ability to control and process all the different layers of geometry and engineering within a single, cohesive building plan like that. Very impressive.
A video tour of the McLaren Technology Centre, designed by Norman Foster, but apparently McLaren principal Ron Dennis had major input on it:
I've read an article which claimed Dennis didn't want to put trashcans in it so people wouldn't eat in their offices. Anyway, it's amazing that they can get so much done with so many people in such a tightly controlled and designed space.