I don’t know how far I’ll go with this, but I want to experiment with LODs and I chose the Empire State Building for my model. I used a few images from Google as references to get the basic shape and proportions. I started with a cube to form the bottom-most section, and then used loop cuts to mark off the sections of the building and extruded them as I worked my way up. It was very easy to do.
This is as as far as I’ll go modelling LOD 1: