When a developer wants a tax break, they need to be specific.  They also need to quantify the ROI for the taxpayer so a win-win can be reasonably concluded.  There should also be a reconciliation clause that would put the developer on the hook for lost tax revenue if it turns out they exaggerated the benefits.  Do you remember the claims made to gain approval for the construction of the Dena'ina Convention Center including moving the Sportsmans' Show and attracting oodles of national conventions?  We don't hear much about that anymore...