Hays Canyon postcard

As found on Ebay: Real Photo Postcard Ranch House & Farm Hays Canyon, California~105955 "A vintage 1920 real photo postcard of a Ranch House and Farm in Hays Canyon, California."

Where was this? Hard to say. If you have any ideas, let me know. I'm guessing that's what's now Moraga Road, heading up toward the Hwy 13 underpass. From Localwiki > Oakland Wiki > Hays Canyon:

Hays Canyon or sometimes called "Jack Hayes Canyon" was the area in hills behind Piedmont.   It was named for Col. John "Jack" Coffee Hays (1817-1883) who lived in the area from 185?-1883.   His estate Fernwood was located approx where Moraga Ave, (Hays Canyon Rd.)  Hwy 13 and Thornhill Dr. (Thorn Rd) meet.  Hays Canyon included the whole area that is now Montclair from the Piedmont border and over to and including Lake Temescal and parts of Shepherd Canyon Rd.   Some of Hays Canyon was in the then, Piedmont District and some in both the Brooklyn and Oakland Townships.  The main road to the canyon was called the "Hays (Hayes) Canyon Rd". which traveled through what is now Piedmont.  It is now known as Moraga Ave,

Here's another view, probably from another time, most likely another house:

UC Berkeley, Bancroft Library > Rodolph (Frank B.) Photograph Collection > Farm Scene, Jack Hays Canyon

"Hayfield at Jack Hays Canyon", from the Rodolph (Frank B.) Photograph Collection

Who was Jack Hays? Read Colonel John Coffee “Jack” Hays (1817 - 1883) - Famous Texas Ranger; S.F.'s First Elected Sheriff and Oakland Wiki > John Coffee Hays.