Appears to be in good shape. I'd ask about the new engine, who put it in and why? Ask about any service records. Give it a test mow. Go very easy and feel and listen for everything.
I bought this unit from a mechanic who replaced the engine and all bearings and belts. I believe he replaced both front tires and (1) rear tire. He sandblasted unit and re-painted it. It has Gator Blades + other set of sharp blades.