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Originally Posted by cityscapes
To what extent can a developer deviate from an approved design without another hearing and or public notice?
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Theoretically, the drawings submitted for building permit are meant to exactly match what was approved during design review. In reality, small changes are allowed if they aren't of any real consequence. A more fundamental change to the approved design is meant to go through a follow up design review. In some cases this can be a Type II Review, which is a lower level of review that doesn't go before the Design Commission.
Which brings me back to this project. I spent a while last night looking at the approved design review drawings vs the photos. There were three primary materials shown for the tower: metal panel; clear glass; and spandrel glass. Spandrel glass is opaque glass that's used when the designer wants the look of glass, but needs an opaque material to hide slab edges, mechanical areas, insulation needed for energy code, etc. Sometimes spandrel glass is tinted differently and highlighted as a building feature, and sometimes it's specified so that it matches the vision glass to the greatest extend possible. In certain light conditions you can't even tell that much (most?) of the glazing at the Cosmopolitan is spandrel glass.
As clearly shown in the renders, the base of the tower is mostly metal panels, with areas of vision glass. Interestingly the placement of the vision glass doesn't seem to quite match the approved drawings, but the proportional split between metal and glass seems to be about the same. Further up in the elevations there was proportionally more glazing shown, but an increasing percentage of it was to be spandrel glass. In the renders there is no differentiation made between the vision glass and the spandrel glass (like the Cosmopolitan).
I am beginning to wonder if the spandrel glass was replaced by metal panels at some point. That would explain why the top of the building is looking so much darker. If so, that's a pretty significant change that probably should have had a follow up design review. I tried looking for the scanned copies of the permit drawings and/or deferred submittal for glazing, but I couldn't find them.