The typical asking rate per listing is in the $20's per square foot per year. The Gladstone region 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 10% increase in rent.
In the last 90 days, 29 listings have been listed, which means spaces are probably going fast. You'll want to be prepared to make an offer immediately. About 3% of the available space in the Gladstone are subleases, so you will probably need to consider the implications of signing a direct lease with the building. There aren't many listings below 2,000 square feet available, so finding a space for a small business might be tough.
Even though the median size is 3,000 sqft, there are still 0 listings below 2,000 sqft. Most properties in this area are close to 2 floors. Most buildings in this region were built in 1983 and are Class B.