On average, listings lease in the $20's per square foot per year. The Gladstone submarket is going through a a boost in rates. In the last 3 months, the median rate rose $1 per sqft per year. That's a 3% increase in rent.
In the last 90 days, 29 listings have been posted online, which means office spaces are probably going fast. You'll want to be prepared to tour spaces as quick as possible. About 3% of the listings in the Gladstone are subleases, so you will probably have to focus your search on direct office leases. There aren't many listings below 2,000 square feet on the market, so finding a space for a small business might be tough.
Even though the median size is 3,000 sqft, there are still 0 office spaces below 2,000 sqft. Most buildings in this region are around 2 stories. Most buildings in this area were built in 1983 and are Class B.