The typical asking rate per listing is in the $20's per square foot per year. The Montgomery County region is going through a decline in rates. In the last 3 months, the median rate decreased $4 per sqft per year. That's a 13% decline in rent.
In the last 90 days, 126 listings have been posted online, so you'll want to check back regularly for new listings. About 6% 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 1,500 sqft. Most buildings in this area are around 2 floors. Most buildings in this market were built in 2001 and are Class B.