The typical asking rate per listing is in the $10's per square foot per year. The Bostonia region is seeing a a boost in rates. In the last 3 months, the median rate went up $16 per sqft per year. That's a Inf% increase in rent.
Compared to the rest of the San Diego market, the Bostonia region has less expensive rates, so you should have no trouble finding a great deal in this depreciated region.
In the last 90 days, 2 listings have come on the market, which means new availabilities might be going fast. 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 800 sqft. Most buildings in this area are close to 2 stories.