Public IPs with vCloud director

Based on Everything i have read, i am pretty sure the answer is no, but would appreciate if someone could confirm.

We have a /19 of public IP address space.

We have a /24 of that already setup on a VMware cluster without vCloud director, we now want to introduce another /24 to be used with vCloud director.

We were hoping that we could use vCloud director, and hand say a /28 to a vCloud customer do with as they please without using NAT (so the public IPs sit directly on the VMs they create)

So my question is, can this be done, or does it have to pass through NAT?

Thanks in advance