A- with or without the land value included? Land is valued (or should be) as if vacant and available for its highest and best use. Outbuildings, pools, shops, etc. should be considered separately. Site improvements ditto. Garages ditto, so the SF value should reflect ONLY the GLA - gross living area.
B- I know that building costs are high in California. But the soft costs are a lot of the reason. 2"x4"'s don't cost much more there than in Kansas or Florida. Soft costs are the thousands spent on permits, inspections, etc. But the actual "building cost" is probably not much over $200, but even if $300, that means $200/SF relates to the land value...
Using distant comps in lieu of closer comps is an issue and there needs to be a justification for doing so.