So, let's do our own. Keeping it simple, there are two main factors:
1) Cost subsidy of $11 million (April 12, 2016 Council Meeting). These costs would normally be paid by the developer.
2) $400,000 additional sales tax revenue per year with Costco vs smaller, diversified retail (August, 2016 study ordered by the City).
$11,000,000 divided by $400,000 equals 27.5 years to break-even when compared to the alternative. If you used a 4% opportunity cost of our money, you would never break-even.
Simple math. Simple question: Is this a good investment? Simple answer is : No!
This is the second worst Costco deal that I can find that has ever been made by any City in the United States.