REAL ESTATE DICTIONARY A I B I C I D I E I F I G I H I I I J I K I L I M I N I O I P I Q I R I S I T I U I V I W I X I Y I Z Results Z Back to top Z-flashing A special type of metal flashing that protects horizontal joints between siding panels that don't overlap. It has a Z-shaped profile and is designed to tuck up under the upper panel and overlap the lower one. zero-lot line The positioning of a house near or on top of the lot boundary, resulting in little or no space between houses. zero-net When the seller receives little or no net proceeds from the property sale. zoning Regulations that control the use of land within a jurisdiction. zoning variance A one-time modification of existing zoning law.