The typical asking rate per listing is in the $30's per square foot per year. The Montgomery County submarket is going through a decline in rates. In the last 3 months, the median rate fell $6 per sqft per year. That's a 16% decline in rent.
In the last 90 days, 173 listings have been made available, so you'll want to check back regularly for new listings. About 3% of the available space in the Montgomery County are subleases, so you will probably have to consider a longer term lease. 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 2,400 sqft. Most buildings in this area are approximately 3 floors. Most buildings in this area were built in 1986 and are Class A.