Most listings are in the $30's per square foot per year. The Dublin submarket is going through a a rise in rates. In the last 3 months, the median rate went up $2 per sqft per year. That's a 8% increase in rent.
Compared to the rest of the East Bay market, the Dublin submarket has less expensive rates, so you should have no trouble finding a great deal in this undervalued submarket.
In the last 90 days, 9 listings have been posted online, which means listings are probably going fast. You'll want to be prepared to make an offer immediately. About 11% of the available leases in the Dublin 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 1,840 sqft. Most properties in this region are around 2 stories. Most buildings in this area were built in 1986 and are Class B.