Most listings are in the $20's per square foot per year. The Wheaton region is going through a a boost in rates. In the last 3 months, the median rate rose $26 per sqft per year.
Compared to the rest of the Washington D.C. market, the Wheaton region has lower rates, so you should have no trouble finding a great deal in this discounted region.
In the last 90 days, 0 listings have been posted online, which means listings are probably going fast. You'll want to be prepared to make an offer immediately. About Inf% of the office spaces in the Wheaton are subleases, so you might be able to find a shorter term or below market rent. 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 2,500 sqft. Most properties in this market are approximately 1 stories. Most buildings in this area were built in 1986 and are Class B.