My nephew used to go to a daycare in the same office complex as my SIL's work. It was great because she could just go down stairs and breastfeed whenever necessary. She could also be very involved with the daycare - get to know the workers and the other kids and parents. This daycare is one of the most highly regarded in the city, run by an organisation called Mothercraft that has other daycares around here. Anyway, I'm sure the developer of this office complex gives them a very reduced rent because I'm sure they couldn't afford market value (the building is in the heart of the financial district) BUT I'm sure the developers saw that the daycare would be really valuable to other tenants and increase the desirability of the building. So everybody wins!
When my former employer built a new office building they looked into including a daycare but opted for a gym instead. I don't know for sure but I'm guessing they couldn't get a private company interested in running it (might not have been enough kids to make it worth their while) and were not prepared to take on the responsibility/liabilty on their own.
I found this organisation after a brief google search. There isn't much on their site but they probably could steer you in the right direction if you called:www.fcforum.org