Well, this is an interesting closing, more for the implications than anything else. Starbucks is not in the business of closing stores that make money, and this is a foot-traffic location, so I would say that this section of Sandhill, at least, does not get as much foot traffic as expected, and that, in addition, they decided it wasn't worth it to move to one of the empty spots on the main drag either.
As for the store itself, I think I stopped there once or twice, and it was fine: A typical Starbucks with no apparent problems.
UPDATE 15 February 2012: Added a night-time picture.
(Hat tip to commenter Elizabeth)
UPDATE 10 April 2013 -- It's now a cupcake bakery: