The typical asking rate per listing is in the $30's per square foot per year. The Cambridge submarket is going through a decline in rates. In the last 3 months, the median rate fell $42 per sqft per year. That's a 54% decline in rent.
Compared to the rest of the Greater Boston market, the Cambridge region has more expensive rates, and you'll need to pay a premium to be in this hot submarket.
In the last 90 days, 29 listings have come on the market, which means leases most likley are going fast. You'll want to be prepared to tour spaces as quick as possible. About 3% of the listings in the Cambridge 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 on the market, so finding a space for a small business might be tough.
The standard measurement for office space in this area is around 1,800 sqft. Most buildings in this area are approximately 5 floors. Most buildings in this region were built in 1978 and are Class A.