I'm adding one of three nines at Bajamar, Ensenada MX. Lagos (Percy Clifford 1976, David Fleming 1991) closed a couple of years ago, a guy who lives there or in the area told me yesterday. Oceano and Vista remain.
And in the San Diego area in the 2000s timeframe, Riverwalk went from 27 to 18 and Cottonwood closed its Lakes course, which was 18. I will try to identify the years of the closings. I think each Riverwalk nine had a name; if I am right and can find an old scorecard, I will provide the name of the closed nine.
Arguably saddest case given its quality: Barona is still using only nine of the original 18.