need opinion of security experts on network design

["shadow floating" <nadengine () googlemail com>]

Hi All,
I've been asked to give an opinion on a network design in which the
designer did the following to a network on multiple buildings of
multiple floors:
1-each floor is a separate VLAN
2-all switches in the floors are layer 3 switches (no layer 2 switches at all)
3-no VLAN spans multiple swtiches,
4-each of the floors' switches are connected via point-to-point
interconnecting VLAN to a core switch
5-No spanning tree at all in the network as each switch is a different
unique VLAN
6-All VLANs routing are done via OSPF protocol
so i have about 50 VLANs with about 50 interconecting VLANs

can any one gives me his opinion from security point of view on that design?

thank you very much

regards,
Nad
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