On average, listings lease in the $30's per square foot per year. The Newton region is going through a decline in rates. In the last 3 months, the median rate fell $1 per sqft per year. That's a 3% decrease in rent.
Compared to the rest of the Greater Boston market, the Newton region has higher rates, and you'll need to make a great offer to be in this hot submarket.
In the last 90 days, 27 listings have been posted online, which means leases most likley are going fast. You'll want to be prepared to make an offer immediately. About 4% of the office spaces in the Newton are subleases, so you will probably need to sign a longer term lease with the landlord directly. There aren't many listings below 2,000 square feet posted, so finding a space for a small business might be tough.
Even though the median size is 9,600 sqft, there are still 0 new listings below 2,000 sqft. Most properties in this market are close to 3 floors. Most buildings in this area were built in 1973 and are Class A.