You're going to be hard pressed to offer space for the prices your mentioned.  Don't forget fire suppression, multiple ISPs, UPS/Generator and redundant power feeds.

Without the ISPs you're a DDoS away from losing customers.
Without a UPS/Power conditioner one lightning strike could do you in.
Multiple power feeds are also a concern along with standby power.  How long is acceptable downtime?

There's a reason most CoLo facilities charge $150-$200 base + a charge per extra 1U per month.