Expensive items to consider:
Since this is a Payette project, all the glass is triple glazed.
Curved glass - Curved glass is expensive. This also means you need curved extrusions. Originally, the project had more actually "curved" areas that were VE'd to be straight facets.
Stainless steel...
Dichroic glass is used at the corner "return" areas, gives it that crazy reflective look that changes as you view from different angles. Product is NARIMA by Schott -$$$$
Copenhill Boston :p
Not really visible from the street, but the stainless steel fins have a random dimple pattern on the top surface of them.
The intent from the Architect (Payette) was that the more horizontally deep fins would have a denser pattern in order to break up ice/snow, and as the...