I assume you mean nano (<2bbl) not >2bbl, right?
I have a 1.6 bbl system, we're about two years in and I would say you really don't have any special needs, nothing that most light industrial spaces come already equipped with.
For water, we have a 1/2" line from the wall and it's plenty. Strike water is heated off my Noritz tankless right to strike temps.
For gas, although there is natural gas to the space, I use propane for the burner (both the tankless HWH and the main kettle burner). I got a 'friends and family' deal from the local propane dealer so my propane costs are manageable.
For power - no need for three phase unless you have some specific need, but with a proper panel and 20a breakers, I run all the brewhouse pumps (2), two a/c units on the fermentation rooms, the 13x9 cold room chill unit, an ice machine, two commercial refeers (one for hops, the other for small fermenters), the WiFi, two laptops, two printers, a Keurig coffee machine, a shredder...well, you get the idea.
Like I said, just make sure you've got your basic light industrial space. You will be good to go.
Don't forget to check out my blog for more details.
Hess Brewing Co
San Diego's first nano-brewery