Every Walnut Creek neighborhood, plus the neighbors.

The retail core around Broadway Plaza, Locust St and Main St: glass doors on closers, restaurant service entrances, and parking garages that stay full long after the shops roll down.

Single-story ranch houses from the 1950s under mature walnut and oak, many with their first set of hardware still on the doors and one family in the deed for decades.

West of downtown around Parkmead Park and Magnolia Way: mid-century homes, families zoned for Las Lomas, and a detached garage at the end of nearly every driveway.

The unincorporated pocket south-west toward Boulevard Way and Olympic Blvd: older cottages beside new builds, narrow streets and driveways that climb away from the road.

The corridor of clinics and office suites around John Muir Medical Center, plus the apartments and condos on Oak Grove Rd that change hands more often than anything else in the city.

Family subdivisions from the 1970s through the 1990s along the upper end of Ygnacio Valley Rd, with wide driveways, side gates and a garage entry door nobody thinks about until it locks.

The business park in the north-east off Ygnacio Valley Rd: office suites, light industrial units, exit devices and access readers, and the weekend calls that come from an empty building.

The gated 55+ community off Rossmoor Pkwy, where the van checks in at the gate, the hardware answers to a mutual standard, and visits are booked in daylight whenever the door can wait.