I think it's called a bay window. I know I read that there was a window coming with C&D that had seating next to it. For the life of me I've looked through every object. I must be blind! lol
it's a separate item (ie not attached to a window) They're under the sofa section and I think there's three. You have to build a bay window-type alcove with the wall tool and then pop it in.