Area, m².
Block it belongs to (−1 for roadside lots outside any block).
Area centroid.
Index of the longest street-facing edge, or −1 for an interior lot (no street access).
Index in the lot list.
Outline, counter-clockwise.
Per edge (edge i = polygon[i]→polygon[i+1]): true if it faces a street.
A parcel of land inside a block.