We have completed work on the procedural modeled city and our rules are as follows.
-Randomly select and draw roads on the grid.
-If there is not a road, assign a each grid square a building and a block
-Randomly select blocks to be rendered as buildings, others will be rendered as "parks" using L-System generated plants

As you can see, we have also textured our roads and buildings, simply, yet effectively.

What we have left to do is complete the L-System plant generation, the particle swarm, the Pure Data audio control with camera movement.

View point of user (always starts on a road)

Random city layout