The typical asking rate per listing is in the $20's per square foot per year. The New Rochelle submarket is experiencing a a rise in rates. In the last 3 months, the median rate increased $26 per sqft per year.
In the last 90 days, 8 listings have been listed, which means office spaces most likley are going fast. You'll want to be prepared to tour spaces as quick as possible. About 13% of the listings in the New Rochelle are subleases, so you might be able to sign a shorter term by taking over a previous lease. 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 2,200 sqft. Most properties in this region are close to 3 floors. Most buildings in this area were built in 1954 and are Class A.