Here are the few links or realtors I’m aware of for modern homes in Bay Area. You’ll notice that modern means mostly Eichler or mid-century modern.
– Eichler City: a wonderful introduction to the contemporary home, or rather mid-century modern and Eichler. Here you will learn about John Mackay, Brown & Kaufman, Stern & Price, Stone & Schulte, American Housing Guild and Bahl houses too. From JohnFyten.com.
–Eichler Homes Realty: A web site hosted by Jerry Ditto, a Realtor and co-author of Eichler Homes: Design for Living. The focus is on the Eichler homes of the San Francisco Peninsula and in the Silicon Valley. This is the site I’ve visited every day for the past months or even years now, thank you very much and we will miss it!