Most listings are in the $20's per square foot per year. The Concord region is seeing a an increase in rates. In the last 3 months, the median rate rose $29 per sqft per year.
Compared to the rest of the East Bay market, the Concord submarket has less expensive rates, so you should have no trouble finding a great deal in this discounted region.
In the last 90 days, 34 listings have been made available, which means listings are probably leasing quickly. You'll want to be prepared to make an offer immediately. About 76% of the available space in the Concord are subleases, so you might be able to snag a great spot on a short term. There aren't many listings below 2,000 square feet on the market, so finding a space for a small business might be tough.
The standard measurement for office space in this area is around 1,980 sqft. Most properties in this market are around 2 floors. Most buildings in this area were built in 1982 and are Class A.