Most of these pieces will be fairly hidden from the outside, so you could use other colors from your collection. You'll need 1x1 bricks (x30) and 1x1 plates (x51), both in light bluish-gray. Although, I did manage to minimize the extra pieces needed to just 2 types. I attempted to make this an alternative build however, I needed some extra pieces to make everything line up properly. In order to minimize the extra parts needed, the floor on the right half is crumbled up but, it could easily be fixed up with some extra parts. The new floor (2nd) is detailed with some of the reporter's level furnishings. The 4th floor is on jumpers, but you have to remove the exterior rails to detach it. The middle three floors (2nd, 3rd, 4th) are connected, along with their front windows. This version is a little less modular than the original set (due to the exterior rail pieces), but it is still really easy to access the inside, thanks to the removable front window design.
This gives the skyscraper the appearance of a much taller building than when it was 2 on 2. The floors on the Daily Bugle are just TOO tall! This modification MOC will turn the original set's 4 floors into 5, making it fit much better with the other buildings in your Lego city! I set 4 'skinny' floors on top of 1 'fat' floor.