This is a photo I took of the existing building in 2003. (You can see 55 E. Erie in the background under construction. There was another beautiful building there, by SOM, that was similar in scale to this one. It's a shame to lose them both.)
The existing building is the church offices, which are going to remain in the new building. The photograph doesn't really do it justice. It's just beautifully planned and beautifully executed - the architectural detail is quite stunning. And the elevated plaza is wonderful - there are no rails, as you can see, and the feeling is very nice. There is also a beautiful reflecting pool tucked in the back.
The architect (I'm going to spell it wrong) was Jim Roesch. Someone should look in the AIA guide to verify this.
You can see this is a classic Chicago-school Miesian structure, but very individual at the same time. Not all of his protégées got that part right.