On average, listings lease in the $10's per square foot per year. The Montgomery County region is going through a a rise in rates. In the last 3 months, the median rate went up $1 per sqft per year. That's a 4% rise in rent.
In the last 90 days, 63 listings have been listed, so you'll want to check back regularly for new listings. About 2% of the listings in the Montgomery County are subleases, so you will probably have to focus your search on direct office leases. 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 2,100 sqft. Most buildings in this region are approximately 1 floors. Most buildings in this area were built in 1979 and are Class B.