DHCP with layer 3

Thanks to the help of Nathan, we were able to solve the issue resolving in DHCP requests/addresses being returned to users through a layer 3 network. 

Once turning on debugging on the DHCP server, in our testing case we were using a router for simplicity, it was apparent that the server was receiving the requests from hosts. However, once the request is sent, the reply is not received. It turned out that the problem lied with the routing protocol, not DHCP itself. To solve the issue a redistribute subnets command was applied to the edge layer 3 routers. 

So that the users are given the correct address/network, an SVI with a corresponding network address in a vlan is used. So that when the broadcast is sent, it shows as that network, therefore receiving an address from the correct network. There is also a ip-helper command applied to each Vlan.