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how to prevent vlans from communicating with each other?

hello guys:

I'm currently planning a network with a few VLANS. Unfortunatly, I'vegone into somw trouble of solveing this!

This is what I got:

basic requirements:

1. all vlans are not able to communicating each other.

2. all vlan hosts can access server vlan (the one in the middle)

2012-08-22_001601.jpg

as you could see, the toppology is really simple ,

i can make building 1 ,2 and 3 into three different vlans and use router-on-stick to connect them to the internet. 

but  i was told there are different offices within each buiding. obviously they don't want communication between offices except servers in the middle. there are 50 offices, by the way.

do i really need over 50 vlans to solve this problem? if so, implementing ACL to prevent vlans from communicating  each other  will be a daunting task for me .

can Pvlan help here?

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