I have a hard time believing most of their payroll is here. Strip is fairly disturbed and probably has huge ops and customer service teams in low cost locations. Their payroll footprint in the city, while significant, will not be burdensome when it comes to gross receipts
Payroll tax is based on apportionment of payroll expense, rather than headcount. It also includes stock based compensation. I'd guess most of their payroll expense is in San Francisco.