How do you consider this a loan by the city? They sold the management concessions for a (potentially) fixed fee and in 75 years they'll get the rights back but nothing more. Or you're saying, this concession is equivalent to $1.16 billion lent over 75 years not adjusted for inflation at a rate of 3.2% rate today?

Also, a rough calculation, but I came out with a 13% nominal return per year for the management company assuming they hit that 10x:

1,160,000,000.00 * 10 = 11,600,000,000.00 -> total earned

11,600,000,000.00 / 75 = 154,666,666.00 -> earnings per year

154,666,666.00 / 1,160,000,000.00 = 13% -> annual return

Which does seem like a very, very nice deal for the concessionaire.