I'm going with 51 also. I think 50 and earlier had the side vents behind the front fender. and 52 and newer had push-button door handles.
Yupp only a mile from my house,24/7 access,wash bays,climate controlled,whole lower level of a huge office building,lots of high end wheels,quiet this time of the year but come oct/nov it’s a full house,can’t store In my garage,too many critters I just can’t get rid of