Okay, this is going to require multiple posts, I can just feel it xD Alright, so I've been working on this for a while, nearly exclusively by myself. Got help from rentless and theravingpixie for a bit, but the majority of it was just me. The inner floors were obviously duplicated (there's no way to mine that much material on my own, and for the most part there isn't even that much material in my world lol), however absolutely every bit of the cobblestone was mined. And yes, it's a rather large mine that gave me that much cobblestone. There are over 250,000 blocks of cobblestone on this skyscraper. It is 64x64x61. The inner floors are made up of different materials, with the exception of floors 9 and 10, which are left empty due to clouds moving through them. Now on to the pics!
This is how it looks during the daytime while standing outside of it.
This is how it looks during the day from the side.
This is outside of it at night.
The first floor/lobby, which is made out of cobblestone
The second floor is made out of iron blocks.
The third floor is made out of gold blocks.
The fourth floor is made out of diamond blocks.
The fifth floor is made out of brick.
The sixth floor is made out of lapis blocks, which I couldn't get a picture of (framerate issues? idk)
The seventh floor is made out of clay blocks.
The eight floor is made out of wood.
The ninth and tenth floors are blank because clouds pass through them.
The eleventh floor is made out of Pure Stone blocks
And the twelfth floor/penthouse is made out of obsidian.
The pictures don't really do it justice. This thing is massive, with easily 300-400 thousand blocks, and lava running down the center encased in glass and glowstone. There is also an arch above the entrance on the inside that is made of glass that's encasing lava. This was made on the X-Box 360. For those of you who don't have Minecraft on the 360, there isn't a creative mode, so I had to lay every block manually. Epic project, I'm very proud that I completed it.