On average, listings lease in the $20's per square foot per year. The Rochester region is experiencing a decline in rates. In the last 3 months, the median rate fell $9 per sqft per year. That's a 30% decline in rent.
Compared to the rest of the Metro Detroit market, the Rochester submarket has lower rates, so you should have no trouble finding a great deal in this depreciated submarket.
In the last 90 days, 5 listings have been posted online, which means leases most likley are leasing quickly. You'll want to be prepared to make an offer immediately. 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 2,020 sqft. Most buildings in this area are approximately 2 stories. Most buildings in this area were built in 1971 and are Class B.