Bench-Mart Retail Greenhouse - 17' wide x 24' long . $5872.00. The Bench-Mart provides full plant protection in an impressive, highly visible structure. It's 17-foot width reduces parking space loss by covering only one row in most retail lots. Easy to set up, easy to move, easy to expand. Each greenhouse contains built-in side and center benching brackets to hold plants, plus each bay includes four runs of hanging basket purlins.