Newsom also owns a house in Marin County
https://www.huffingtonpost.com/2011/11/29/gavin-newsom-buys-house-in-marin_n_1119560.html
purchased in 2011 for $2.145 million
No it is not a very diverse neighborhood.
Demographics of Newsom’s Kentfield Marin County neighborhood:
The racial makeup of Kentfield was 5,908 (91.1%) White, 35 (0.5%) African American, 10 (0.2%) Native American, 224 (3.5%) Asian, 7 (0.1%) Pacific Islander, 95 (1.5%) from other races, and 206 (3.2%) from two or more races. Hispanic or Latino of any race were 299 persons (4.6%).
Demographics of Newsom’s Fair Oaks neighborhood:
The racial makeup of Fair Oaks was 26,479 (85.7%) White, 729 (2.4%) African American, 255 (0.8%) Native American, 1,289 (4.2%) Asian, 57 (0.2%) Pacific Islander, 738 (2.4%) from other races, and 1,365 (4.4%) from two or more races. Hispanic or Latino of any race were 2,954 persons (9.6%).