Earlier quoted context omitted.
It’s not just empty fields. It’s also empty buildings. A grocery store sized unit sat vacant in my San Francisco neighborhood for over a decade. Cheap property tax due to Prop 13. Owners wanted to wait for the “right offer” to develop it.
Many of the abandoned houses in Detroit are owned by speculators who will do nothing with it but wait for land prices to increase.
It's hard to justify telling land owners to pay high property taxes when the city delivered the highest crime rates and worst performing schools in the nation in exchange for those tax dollars.