LOL Barand. I must have messed up writing it because I drew something much different on paper. Hang on.
Change 2,3 to -1,3.
BTW, how are you going to handle plots that don't have four corners? I almost bought this place (but the house had termites). This property is a triangle. (The major highway cuts through at an angle to what the original lots all were, so there's lots of triangle lots.)
https://maps.google.com/?ll=33.326714,-96.491447&spn=0.0019,0.004128&t=h&z=19
I also some some 5-sided lots out there.
Edit: Here's a 5 pointed one.
https://maps.google.com/maps?hl=en&ll=33.190146,-96.643148&spn=0.000952,0.002064&sll=33.190169,-96.643066&sspn=0.000956,0.002064&t=h&z=20