There are non-tax benefits, such as bypassing probate, but as the value of a property increases the 1% property tax becomes increasingly worrying. I suspect this is part of the reason why it's more common with commercial real estate.
The goal is to avoid tax reassessment when a property is sold, which is a big deal since the average price of a house in CA in 1940 was $36,700 and is now $211,500 (and much, much higher in places like Los Angeles and San Francisco). Even at the average house price, it's the difference between a $367/yr bill versus a $2,115/yr bill. Presumably commercial real estate has seen an equivalent rise over time.
http://www.boe.ca.gov/proptaxes/leopcio.htm
I wonder if it frequently just isn't worth unwinding the corporation.