Wow, I used to live near the UPMC shadyside expansion and it has certainly come a long way in 10 years. It is great that the Ford building on Baum has been reused in a relatively preserved manner. Also, it is exciting to see the area returning to the density it once had. Pittsburgh seems to be embracing the mid-rise density it saw in its heyday.
The one qualm I have about recent development on the center/baum corridor is the Marriot hotel built on the corner of center/baum/aiken/liberty. The surface parking lot was put in front of the building. It has ruined any possibility of bringing back a thriving district that people enjoy being in. It now seems doomed, for the immediate future, to be a concrete wasteland that people pass through as quickly as possible when on their way to somewhere more appealing. Next time you're at that intersection, check out the feeling there. It is definitely a place that puts you on edge, a place that you want to leave as quickly as possible. It is subtle and mostly subconscious, but is quite obvious when actively evaluating the topic.
That neighborhood would be better if the Marriot had been built along the sidewalk and the surface parking placed behind it. What Pittsburgh doesn't need is surface parking lots in front of buildings that form dense and walkable business districts.
Edit:
Here is a street-view link:
http://goo.gl/maps/I6Ic0
The trees soften the effect somewhat. They may even give opposite conscious and subconscious impressions. At first we might be like "hey trees, that's nice". But in reality nobody wants to spend one second more there than they have too.