That neighborhood was depressed during the Great Recession. Many home owners were stuck there. With homes reach historical high, many are cashing out while the price holds well. For 700-800 one can get a home half the price of 95130, 95129 etc.
EVERYTHING in real estate is negotiable. Your agent should know how to negotiate the transaction because one goof means you got a foreclosure on your credit for 10+ years.
I've had short sales where contribution was required from the Seller [one of the Sellers had significant assets and was willing to contribute to make the deal happen] - but the vast majority of shorts that I have done have had no Seller Contribution.