On average, listings lease in the $30's per square foot per year. The Moraga submarket is going through a a boost in rates. In the last 3 months, the median rate increased $35 per sqft per year. That's a Inf% increase in rent.
Compared to the rest of the East Bay market, the Moraga region has smaller rates, so you should have no trouble finding a great deal in this depreciated submarket.
In the last 90 days, 5 listings have been made available, which means new listings are probably 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 posted, so finding a space for a small business might be tough.
The standard measurement for office space in this area is around 1,030 sqft. Most buildings in this area are around 1 floors. Most buildings in this market were built in 1981 and are Class B.