Okay, I've lost it. On my way home from a doctor's visit for new baby I realized I was probably near where Lansing's avocado farm was. I took a mile detour to the intersection of Copper Drive and Melrose. From what I found I think it is in what is Vista today and not San Marcos. I found the assessor's map and sent it to a title company to search for the records showing ownership in 1948 by James Martini, James Lansing and or Glenda Lansing. I will take a picture of the intersection tomorrow and post it. Now who is going to make a plaque for me to post there?