City values are influenced by many factors, including location, of course, but median home size is another basic consideration. All things being equal - especially pertaining to the quality of location - a smaller home will sell for a lower price, naturally, but a higher dollar per square foot value. The fact that Belvedere has the largest median home size and close to the highest average $/sq.ft. value (plus the highest median home sales price) establishes it clearly as the most expensive market in Marin (and one of the most expensive in the Bay Area). But there are several very affluent communities - Ross, Tiburon, Kentfield and so on - close behind it. And of course, communities with lower median or average values often contain extremely expensive homes as well.