Here's a link to my model

SKP File

I used Sketchup Pro 2014

Custom Textures

More Stairs

Forgot to put the second set of stairs in my sketchup, here's some pictures of it included in the final model. I also included the conceptual sketch for these stairs. You'd be able to walk up and down on each side as well as drive down in the middle. The angular bits on the side are to prevent the bike clipping on the stairs. They also add in a bit of triangular form like the top stairs.

Animation Three - Garage Walkthrough

Animation One - Section Cut

Animation Two - Restaurant Walk Through

Progress Shots