Empire state for New York rooftops

Working on an empire state building for New York Rooftops assignment. It probably won't get any higher (poly count) than this because it will be quite far away from the player. , therefore no need for detail. I began with blocking it out, then extruding. The grey part of the building was done as a "duplicate special" (made half of it, and duplicated it as a instance so everything I do on one half, happens to the other one.  The very top part was mostly blocks, however I wanted to include SOME detail into the building, so i did some extrusion. It's going fairly well! will be done soon

Grey part of the building was done as a mirrored block.