A group of city residents would like a new park in their neighborhood. They submit a signed petition to city hall. The city agrees that a park should be built, and a city planner identifies a suitable location for the park. The location, however, is an overgrown, abandoned lot with a building that is clearly a hazard. Any other location is too far away to suit the needs of the citizens who petitioned.

What should the city do next?

Begin construction of the park's playground on the abandoned lot
Find the owner of the building and fine him for causing a hazard
Find out who owns the land and offer to purchase the property
Condemn the building to eliminate the hazard and clear the land