On average, listings lease in the $20's per square foot per year. The Sherwood submarket is going through a a boost in rates. In the last 3 months, the median rate rose $11 per sqft per year. That's a 68% increase in rent.
In the last 90 days, 12 listings have been posted online, which means office spaces are probably going fast. You'll want to be prepared to make an offer immediately. 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 810 sqft. Most properties in this market are around 1 floors. Most buildings in this region were built in 1985 and are Class B.