Such a tax would be especially beneficial in a city like Philadelphia, where such a high proportion of lots are sitting vacant or uninhabitable and the owners a

Such a tax would be especially beneficial in a city like Philadelphia, where such a high proportion of lots are sitting vacant or uninhabitable and the owners are nowhere to be found. It also doesn't help that the city is derelict in its duty to collect existing property taxes, and has been entirely incompetent when it comes to claiming those properties and reselling them.