Divvied amongst 18 apartments:

not including phone line connection (?) and rental ($20 per month approx)

Setup Fee:
New ADSL Service $129

Hardware (Approx prices):
ADSL Modem $400
24 Port Switch $500 Or Wireless routers
Ethernet Cabling? Need to check it out. Looks good.

alt.
Wireless -
ADSL Modem $400
Wireless Antennaes $250 (will need at least two)

Monthly fee:
HOME-1500-Power20 $59.95 1500k / 256k 20 GB Shaped
http://www.internode.on.net/adsl/pricing/home.php
or
SOHO-1500-Power20 $79.95 1500k / 256k 20 GB SOHO Shaping
http://www.internode.on.net/adsl/pricing/soho.php

Internode Standard Form of Agreement (SFOA):
http://www.internode.on.net/sfoa/index.htm

need to know:
Suggested switch/router to go with ADSL modem. About 10 users at a time.
Does existing wiring support ethernet?

Summary:
$1000 initial set up ($55.55 each)
$60 (ADSL) + $20 (phone line) per month ($4.44 each)