The typical asking rate per listing is in the $10's per square foot per year. The Biloxi submarket is going through a a boost in rates. In the last 3 months, the median rate rose $2 per sqft per year. That's a 11% rise in rent.
In the last 90 days, 1 listings have come on the market, which means listings are probably going fast. You'll want to be prepared to tour spaces as quick as possible. About 400% of the listings in the Biloxi are subleases, so you might be able to sign a shorter term by taking over a previous lease. 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 1,350 sqft. Most buildings in this area are close to 1 floors. Most buildings in this area were built in 0 and are Class B.