Tarheel, I understand the use of 'feature' as a verb or a noun, but in this context it is used like an adjective ('a room with feature brick fireplace'). I suppose this is quite unusual? Does this sound very formal, stilted or even 'wrong'? I mean, real estate agents aren't necessarily very good linguists!
It seems wrong to me. If that is really what it says ("a room with feature brick fireplace") then it might be from somebody who is clumsy with his words. I just don't think "feature" works as an adjective. (Rover is right that it is real estate jargon.)
It works as an adjective in BrE.