Kevin (I know that dude!) has a great article over at Shooting Illustrated.
Carrying in the office is something I've never considered, living and working in MA. There's nothing specifically prohibiting it in my office, other than the fact that an inadvertant exposure would most likely get me fired and also blacklisted from working in MA ever again. ("Why did you leave your last job?" "Oh, I got fired for carrying a gun. SECURITY!!!") Kevin's a practical guy, so he rated several different carry methods with regard to how they work with business casual.
It's a good read, go take a look!
That is all.