Most listings are in the $40's per square foot per year. The White Plains region is going through a an increase in rates. In the last 3 months, the median rate increased $1 per sqft per year. That's a 3% increase in rent.
In the last 90 days, 36 listings have been made available, which means leases are probably going fast. You'll want to be prepared to tour spaces as quick as possible. About 3% of the listings in the White Plains are subleases, so you will probably have to focus your search on direct office leases. There aren't many listings below 2,000 square feet available, so finding a space for a small business might be tough.
Even though the median size is 3,700 sqft, there are still 0 new listings below 2,000 sqft. Most buildings in this region are around 5 floors. Most buildings in this market were built in 1978 and are Class A.