The typical asking rate per listing is in the $20's per square foot per year. The Galveston submarket is going through a a rise in rates. In the last 3 months, the median rate increased $8 per sqft per year. That's a 50% rise in rent.
Compared to the rest of the Houston Metro market, the Galveston submarket has lower rates, so you should have no trouble finding a great deal in this discounted submarket.
In the last 90 days, 10 listings have been made available, which means office spaces are probably 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 available, 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 properties in this area are approximately 2 stories. Most buildings in this market were built in 1973 and are Class B.