On average, listings lease in the $10's per square foot per year. The Mentor submarket is going through a decrease in rates. In the last 3 months, the median rate fell $5 per sqft per year. That's a 23% decrease in rent.
In the last 90 days, 30 listings have been listed, which means new listings are probably leasing quickly. You'll want to be prepared to make an offer immediately. 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 900 sqft. Most properties in this area are around 1 stories. Most buildings in this area were built in 1988 and are Class B.