The typical asking rate per listing is in the $10's per square foot per year. The Bostonia submarket is seeing a a boost in rates. In the last 3 months, the median rate went up $16 per sqft per year.
Compared to the rest of the San Diego market, the Bostonia submarket has smaller rates, so you should have no trouble finding a great deal in this undervalued region.
In the last 90 days, 0 listings have been posted online, which means listings most likley are going fast. You'll want to be prepared to make an offer immediately. About Inf% of the office spaces in the Bostonia 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 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 market are approximately 2 floors.