In San Francisco, the walk score is an essential part to a homes value. So many people want the convenience of restaurants, transportation, shopping and in your case grocery stores. The addition of Whole Foods, a major successful market in that area on Ocean Blvd. will most likely bring in more people who would otherwise look in somewhere else. The addition will act as an anchor for the community to gather, a place to get GREAT food and support strong commerce. Let me know if I can give you a home evaluation or find some comps in the area.... more
If you haven't done it yet, you should visit the assessors portion of SFGov.org They will be able to explain the process of appealing your property tax base. There are also deadlines, so you should check right away to see if you've missed the deadline for 2010-11 year taxes. My guess is that you have.
As far as value is concerned, sounds like you've already identified the 3 comparable sales you need. I'm not sure which the assessor will latch onto-likely the higher of them.