Most listings are in the $20's per square foot per year. The San Leandro submarket is going through a a rise in rates. In the last 3 months, the median rate increased $4 per sqft per year. That's a 20% rise in rent.
Compared to the rest of the East Bay market, the San Leandro region has less expensive rates, so you should have no trouble finding a great deal in this undervalued region.
In the last 90 days, 36 listings have been posted online, which means listings most likley are leasing quickly. You'll want to be prepared to tour spaces as quick as possible. 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 1,540 sqft. Most properties in this market are approximately 1 stories. Most buildings in this market were built in 1973 and are Class B.