The landslide cut off utilities to the hillside mansion, leaving pipes and other infrastructure exposed to the elements.
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The ground gave way in the 1400 block of Sunset Plaza. It took out landscaping and terrain next to the home and left his silver Jaguar inundated with mud and debris.
It's not clear how stable the home itself remains.
This is not the first disaster to befall the singer's home.
In 2015, the hillside mansion was destroyed by a fire. At the time he said he had owned it for more than five decades.
Fire tears through singer Johnny Mathis' Hollywood Hills home
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Mathis, now 87, is a pop and jazz singer inducted in the Grammy Hall of Fame who has released at least 79 studio albums over the course of a career dating back to the 1950s.
He continues to perform, with more than a dozen dates set on tour in the first half of 2023.