The city of Los Altos web site has maps of the city designating public/private areas. See the city map files:  https://m.losaltosca.gov/sites/default/files/fileattachments/Building%20and%20Planning/page/429/updatedlandusemaplarge.pdf
And 
https://m.losaltosca.gov/sites/default/files/fileattachments/Building%20and%20Planning/page/429/updatedzoningmaplarge_000.pdf
 located on the city's web page:https://m.losaltosca.gov/communitydevelopment/page/adopted-plans