Walnut Creek prices in a narrow corridor: $345 to $390 per m² a year across the 18 offices listed. A spread that small between the cheapest and the dearest quote tells a tenant that shopping around Walnut Creek on rate alone yields little, and that the negotiation is better spent on lease term, parking and fit-out contribution.
Because the median in Walnut Creek sits at $345 — the same figure as the lower bound — at least half the stock is quoted at the floor of the range. The $390 asks belong to individual better-specified units rather than to the market as a whole, which is a useful check when a landlord presents the top of the band as standard.
Walnut Creek's 2 listed buildings sit on the axes that define the local office market: California Plaza on North California Boulevard in the downtown core, and 1255 Treat Boulevard on the Treat corridor to the north. Splitting 18 units across those two addresses means a tenant is really choosing between a walkable downtown setting and a car-oriented one, with rents in both cases inside the same $345 to $390 range.
Sizes in Walnut Creek stretch from 5 m² to 520 m², with the median at 72 m². The distance between a 72 m² typical unit and the 520 m² maximum is unusual for a two-building market, so a company planning to consolidate several teams should treat the large-format space as scarce and move on it early rather than wait for a second option to appear.