I was walking to a friends yesterday and noticed that someone was moving in to the 14th floor of an apartment and I thought that you should see how it is done here.
It is done with the help of a lift truck. Set up the truck below your apartment, extend the rails upwards and you are ready. There is a platform that travels along the rails you. You load it full of your goods, it takes everything from beds to dressers to books, if you can fit it on the platform it will get to your window. Then send it up. Unload it and send it back down.