The typical asking rate per listing is in the $10's per square foot per year. The Salem region is seeing a decrease in rates. In the last 3 months, the median rate fell $4 per sqft per year. That's a 18% decline in rent.
In the last 90 days, 91 listings have come on the market, so you'll want to check back regularly for new listings. About 1% of the available space in the Salem 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 on the market, so finding a space for a small business might be tough.
The standard measurement for office space in this area is around 1,500 sqft. Most properties in this region are close to 2 floors. Most buildings in this market were built in 1984 and are Class A.