Most listings are in the $10's per square foot per year. The Bolton submarket is going through a decline in rates. In the last 3 months, the median rate decreased $1 per sqft per year. That's a 6% decline in rent.
In the last 90 days, 40 listings have come on the market, which means listings most likley are going fast. You'll want to be prepared to make an offer immediately. About 3% of the available space in the Bolton 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 posted, so finding a space for a small business might be tough.
The standard measurement for office space in this area is around 1,210 sqft. Most buildings in this market are approximately 1 floors. Most buildings in this market were built in 1987 and are Class B.
Not much of the real estate is used for commercial space, so it might be hard to find office space. Education is the dominant industry in this market. Most of the folk of Bolton work from home. Commuting around 30 minutes a day is the norm for those who opt to reside in this part of town.