montauk used cast iron and a wrought iron on its exteriors and floors. the exterior and the central core are made out of hydraulic pressed brick that allows you to go up these 10 stories with relatively small dimensions. you can see the problems right away, though. if you are trying to open up large windows on the exterior, brick is heavy. it is not certainly as strong as iron, and therefore your window sizes are very limited. as you go down the building to the ground floor, where you might want to put shops, retail, the self weight of the brick demand larger and larger piers. the floors that have the most brick, the least glass are the ones at the street level that probably need them the most. you can see that the montauk stands up through the use of sheer walls. the brick is arranged so that north-south and east-west, you have a fairly regular grid of walls that prevent the building from wracking or swaying in the wind at all. very effective but space intensive. the brick takes up a great deal of area. brick, at the end of the day, is heavy, it is slow