I'll put this out the Internet.
Here's a blog posting for the San Leandro Group.
Back in early 1980s when I was attending San Leandro high school, one of my best friends was Liz R. Over 25 years later little does she know that she holds the key to confirming that Derry, Weaver & Derry homes were designed by W.R. Yelland.
I am looking for her to help confirm this information. If anyone knows how to get a hold of her, please let her know that I am trying to get a hold of her. Even better maybe one day she will google herself and find this and get in touch with me.
So the Story is. Back in 1981 when we were in our junior year, Liz's parents sold their beautiful storybook Tudor on Lee Avenue. It was a big deal back then. It was featured in a fine homes magazine and sold for a quarter million dollars. That was a big deal back then.
I remember asking Liz what the big deal was about. She said that the home was designed by a famous architect. I kinda recall her saying that it was W.R. Yelland. I recall saying "who".

(The Bruner Residence)
The home she lived in was built as the Judge Bruner Residence by builders Derry, Weaver & Derry. Tom Derry married into the Bruner and Lee families here in San Leandro. So, the home was built for Tom Derry's in-law relatives.
It's quite amazing that the Bruner/R. Residence is very similar to homes found in Berkeley's Brittany Village. Brittany Village is directly behind Normandy Village by W.R. Yelland. It makes me think that Brittany Village could also be by Yelland
(Brittany Village)
So the homes in Leeland Heights, The Broadmoor, Estudillo Estates by Derry, Weaver & Derry and the later Derry Bros. could very well be Yelland too.
Well Michael,
If she googles her name, it's the #1 result, so GOOD LUCK!!! :)