Lot line

Lot lines are a lot's recorded boundaries, and zoning classifies them by position: front lot lines along the street, side lot lines running back from it, rear lot lines opposite the front. The classification is load-bearing — yard obligations attach per class, so which line counts as which determines where the required open areas fall. Corner and through lots, having more than one front, scramble the classification and with it the obligations.

The tax map draws lot lines; surveys confirm them on the ground. Irregular lots make classification genuinely hard, and the definitions anticipate the difficulty. When buildable-area assumptions fail on odd-shaped lots, the failure usually begins with a lot line classified by eye instead of by rule.