Like many towns, David City has its share of vacant houses, most of them older structures. Over time, some property owners discover they are a good place to park a worn-out appliance, the old couch or other items that are in the way. What may begin as a short-term solution can become a permanent storage unit. And a few items tend to attract more items. The City Council, which has been working to abate nuisances and improve the community’s appearance, has such properties in its sights.