Wiktionary
vacant lot
n. an unused area of land in an urban area (not built, not a farm, not a park)
WordNet
vacant lot
n. a lot on which there are no permanent buildings [syn: building site]
Usage examples of "vacant lot".
I drove by 39th and Norton, saw that houses were going up on the vacant lot and thought about her.
He had placed the bundle, then hired a room overlooking the vacant lot and had remained there at the window for hours.