What Would You Charge for Commercial Cleaning Services?

I haven't done commercial cleaning and I am at a loss. What would you charge for the the cleaning of an office building 5 000 sq ft 3 times a week, 16 stalls toilets, 6 sinks, dusting, vacuuming, dust window blinds, window sills, dust and vacuum 20-30 cubicles, lunch room? I will provide equipment

Thanks for those who takes time to answer