tax desert

A definite area within a larger city/municipality in which the tax revenue generated is considerably less than the areas around it.
Tax deserts often have a relatively large number of abandoned buildings, the Body Mass Index of the average citizen is markedly higher than average.

A tax desert often occupies the same space as a food desert- (re: Mari Callagher)

The South Loop of Chicago used to be a "tax desert" but was renovated and now serves as a major tourist destination in the city.