Most listings are in the $30's per square foot per year. The Concord region is seeing a an increase in rates. In the last 3 months, the median rate went up $2 per sqft per year. That's a 4% rise in rent.
Compared to the rest of the East Bay market, the Concord submarket has smaller rates, so you should have no trouble finding a great deal in this undervalued submarket.
In the last 90 days, 34 listings have been posted online, which means office spaces most likley are leasing quickly. You'll want to be prepared to make an offer immediately. About 12% of the office spaces 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 available, so finding a space for a small business might be tough.
The standard measurement for office space in this area is around 2,200 sqft. Most properties in this market are around 2 stories. Most buildings in this market were built in 1984 and are Class A.