Ali Heravi's Page

I believe that Rabbit can help you.

What I would try to do is use a rectangular grid tool to begin. Then, you can add number sliders to the grid to adjust the cell dimensions.
if you want a non-rectangular site division, I would try using a "subdivide Surface" tool and possibly using a simple attractor point definition to produce a proximity relationship of lines or geometries.

For more information, search the Grasshopper forums for site planning, subdividing surfaces, street networks, and attractor points.

Feel free to send me your .ghx grasshopper definition file so that I can see what you're trying to do.

Best,

Cameron