48th was not owned by the Legg's--they owned the skating rink on Ocean Avenue across the street from the El Rey Theatre. Phyllis and Harris Legg gave lessons. ( I took skating lessons from them around 1958) They were in the Ice Follies. They later moved to Market Street near Van Ness Avenue.
48th skating teachers I had were the Thomas Twins--Terry was my teacher.
I also skated when I was about four at Sutro's.
Hope this helps!