Are you talking about Mount St. Mary’s which is up the hill from the Marymount Grammar School?
Marymount is right on Sunset Blvd. Right across the street is St. Martin of Tours Catholic Church. It is a one story traditional, with a huge lawn out front. The PoolHouse to the side.
I also went to Marymount Girls School in Westwood, right across the street from UCLA on Deadman’s Curve. This high school has a large statue of Christ standing in a grotto. He often had a cigar in his outstretched hands. :o)
The first one is in Brentwood, right? I think the second school is the one I was thinking of, on Sunset in Westwood. I went to UCLA and so did both my parents.