After 26 years in the West Adams district, the Marlborough School moved to Hancock Park and opened at its current site on the corner of Third Street and Rossmore Avenue.

Blake expanded the curriculum substantially and the School gained a reputation for providing young women with an uncommonly rigorous education.

The Los Angeles business community actively supported the school in the latter half of the 20th century, with local titans including Robert H. Ahmanson and Charlie Munger donating generously.

In recent years, the most popular postgraduate destinations for Marlborough women include a mix of elite private and "public ivy" institutions.

[9] Recent guest speakers at Marlborough include Queen Rania of Jordan,[10] former Secretary of State Madeleine Albright, Pulitzer Prize-winning New York Times columnist Nicholas Kristof, historian Edward L. Ayers, Nobel Prize Laureate Leymah Gbowee, and producer/actor Mindy Kaling.