Is this a hawk? He is perched on my ledge at my office

Chuck-wills-widow?

Very interesting. He resembles the birds I see in the middle of ranch roads at night. They don't take off until you almost run over em. I doubt he is.

I am thinking swallow of sorts...

It's a Bullbat http://en.wikipedia.org/wiki/Common_Nighthawk

Does the roof of your office have gravel?

It's a chickenhawk...

COMMON NIGHT HAWK! Always wondered what those birds were. I thought ground owl for the longest time.

The species on the ranch roads are poorwills, a nightjaw like this nighthawk.

Yes it does

Yes it is a nighthawk, their preferred nesting areas are in the fields. As a kid I would stumble onto the nests from time to time. They are insect eaters. Late evenings we would see them dive and make a sort of voorroom sound during their dive. Their eyes are red. They very helpful and harmless.

In cities they will roost on gravel roof tops. They serve as an analog to gravel covered prairies. Look around light posts at night and you will see and hear them feeding. They make a sharp scream. They will be gone in a few weeks. Enjoy while they are here.