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Well, our little business that started with just my Dad and I and one other guy has grown to the point where we are getting a new building.

Excellent!

Racks should be bolted into concrete or something else immovable, but you might want to consider buying a cabinet instead. Since its corners are outside the weight, it need not be bolted down, which is useful if you ever want to move it. Of course, they're more expensive than racks by quite a bit.

I don't see any problem with a window-mount AC, but you might want to at least put in ductwork in case it becomes too little at some point in the future. Also, computer rooms should also have humidity control, too, which a window-mount unit won't have. It's probably not a big deal if you're talking about one rack's worth of heat, but it might be an issue later on.

You might want to consider installing 220V power in the room. Almost all (if not all) computer equipment can handle 220V and it's a little more efficient. Whichever way you go, make sure that the circuit you have installed is well grounded.

All the server rooms I've dealt with have a UPS on the whole circuit. You might want to investigate that, but I don't have anywhere to point you about that. Liebert is a common choice for AC/Humidity and UPS, IIRC.
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Bitt Faulk