Walnut Creek is the commercial and HOA hub of central Contra Costa County — a city that punches above its population weight in terms of HOA density, particularly in the Rossmoor active adult community (one of the largest gated retirement communities in the United States, with over 6,600 units) and in the hillside condominium developments overlooking downtown. Outside of Rossmoor, Walnut Creek's HOA market is concentrated in mid-century conversions along Ygnacio Valley Road and newer townhome associations in the south and west.
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