The 'What If?' Metropolis - Modelling Progress

Today I made a start on my city in Maya. I started by modelling one of the individual buildings that will be in the city. After this I'll duplicate the building and make some changes to it to make all of the buildings a different shape, even if they're the same style. Here's some progress pictures of my modelling:

Basic shapes

Building up the spheres for the house

I made the top by creating a curve and then extruding a polygon along that curve

Test render of the current model

I'm still looking to improve this as it looks a bit wobbly and the spheres don't look right just yet. Just wanted to show the progress I've made so far, even if it isn't finished!