The typical asking rate per listing is in the $40's per square foot per year. The Gaslamp submarket is seeing a a boost in rates. In the last 3 months, the median rate rose $47 per sqft per year.
Compared to the rest of the San Diego market, the Gaslamp submarket has more expensive rates, and you'll have to negotiate above asking rent to be in this hot region.
In the last 90 days, 20 listings have been listed, which means new availabilities most likley are leasing quickly. You'll want to be prepared to make an offer immediately. 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 240 sqft. Most properties in this market are around 3 floors. Most buildings in this market were built in 1911 and are Class B.
Not much of the real estate is used for commercial space, so it might be hard to find office space. Finance and insurance are the dominant industries in this market. Commute by motorcycle is the most popular way to get to work amongst Gaslamp folk. Commuting close to 10 minutes a day is the norm for those who opt to reside in this part of town.