Renewal by Andersen, for example, can make an operable custom-built casement window down to a width of 16 inches. Using a low-profile composite frame, such as Andersen’s FIBREX, window frames can be much narrower than a bulky vinyl frame. And with a narrow window you will want to have as much glass area as possible.
This casement window solution won’t disturb the brick either, and you will get a great view with all that wonderful glass area. Plus the fact that you can crank open a casement window to let lots of fresh air in too.