On average, listings lease in the $0's per square foot per year. The Allegan region is going through a decline in rates. In the last 3 months, the median rate decreased $17 per sqft per year. That's a 100% decrease in rent.
In the last 90 days, 0 listings have been posted online, which means new availabilities are probably going fast. You'll want to be prepared to tour spaces as quick as possible. About NaN% of the available space in the Allegan 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.
The standard measurement for office space in this area is around sqft. Most properties in this area are around 2 stories. Most buildings in this area were built in 1892 and are Class B.