The typical asking rate per listing is in the $30's per square foot per year. The Bryn Mawr submarket is going through a a rise in rates. In the last 3 months, the median rate rose $38 per sqft per year.
In the last 90 days, 3 listings have come on the market, which means listings might be leasing quickly. You'll want to be prepared to make an offer immediately. There aren't many listings below 2,000 square feet posted, so finding a space for a small business might be tough.
The standard measurement for office space in this area is around 1,410 sqft. Most properties in this market are close to 2 stories. Most buildings in this market were built in 1964 and are Class B.