I think a daycare that's close enough to mom that she can go nurse her child 2 or 3 times a day is going to be a simpler solution. Nursing is the crux problem. I'm a dad, but I have never heard any mother speak kindly about pumping. It's a huge logistic pain, and quite unpleasant for most moms.
Nursing is a big problem/benefit, but far from the only one. There are a lot of other problems that can require a parent's personal attention for a few minutes, and having an essentially zero commute time would greatly simplify dealing with those. And spending a 10 minute break playing with the kids can at times be much more refreshing than anything you can do at a normal corporate site.
