On average, listings lease in the $50's per square foot per year. The Bethesda region is seeing a decrease in rates. In the last 3 months, the median rate decreased $1 per sqft per year. That's a 2% decrease in rent.
Compared to the rest of the Washington D.C. market, the Bethesda region has higher rates, and you'll need to pay a premium to be in this hot submarket.
In the last 90 days, 32 listings have been made available, which means spaces most likley are leasing quickly. You'll want to be prepared to make an offer immediately. About 3% of the listings in the Bethesda 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 2,080 sqft. Most buildings in this area are close to 10 stories. Most buildings in this area were built in 1976 and are Class A.