the value created if graffiti was cleaned from the area would be larger. in a large block, eg, 18th to 19th, Mission to Valencia, there would be about 80 properties. Estimate a million each property. 80 million. A permanent wide spread reduction in graffiti would raise property values by estimate 1%. So the value for a single large block would be $800,000.
Does that sound like correct the order of magnitude?