It's not provided, but there is a daycare in the building(Fed). When I looked at it, it was very nice, with parents walking in and out. There was a waiting list of a year for infants (their rationale was 9 mos pg + 3 mos maternity leave) and was $1500/month for an infant.
Yes - Bright Horizons
It is in the building
Yes there is a waiting list. I go on it when pregnant and put DD in a 6 months (when I returned from leave)
Yes for the most part, although I don't think the service they provide is in line with what they charge ($1815/month in downtown DC)