I am designing an addition for my local hardware store. The rear of this 335 sf addition backs up to a fence, one side joins the existing building and the other side faces the street. The font will have to nice picture/display windows. I need a thin unit I can build into the interior of the store and direct vent to the rear which backs up to the fence. I thought of one of those motel units that sit low on the windows but wasn't sure how much of those stuck out on the outside. We could put a regular window unit on the side that faces the road, but I don't think that's going to look very nice. Any suggestions would be greatly appreciated.

Fujitsu ductless heatpump. Mini split