Whats Important To You In A Colo Facility

We are in the process building a new colocation facility and I wanted to take some input from everyone here. We have most of the infrastructure planning and layout done but were still early on in the construction phase so now is the last chance to get some input. I have two main questions I wanted to ask.

1)When your looking for a colocation facility what things are most important to you?

2)Have you ever wished that datacenters offered something outside the normal things that most providers do.