Yeh, there's also one on the sidewalk there. Hopefully they keep both. I talked to one of the demolition guys and he said they are taking a few more of the buildings down in the area and being replaced with a new shopping center.
https://cloudup.com/cRsaA-QRV6F
The physical lab wasn't a part of the history of humanity, what was done there -- that's what is important. The building was not in good shape and the landlord(s) have had trouble finding long term tenants for the site for decades. A shopping mall and high density housing are a much better use for the site. The building may be gone, but memories of Shockley, both the good and the bad, live on.
By that reasoning, BT's plans to build on Bletchley Park would have been fine. The physical context of a place is often a central part of understanding the an activity and how the people involved worked.
It's been in the works for a while. This article is from April 2013:
http://www.mercurynews.com/ci_23003899/cassidy-readers-inspi...
According to this it was not "practical" to save the building.