On average, listings lease in the $20's per square foot per year. The Whitehall submarket is going through a a boost in rates. In the last 3 months, the median rate went up $21 per sqft per year.
In the last 90 days, 3 listings have been posted online, which means listings most likley are going fast. You'll want to be prepared to tour spaces as quick as possible. About 100% of the listings in the Whitehall 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 available, so finding a space for a small business might be tough.
The standard measurement for office space in this area is around 2,300 sqft. Most buildings in this market are close to 1 stories. Most buildings in this market were built in 1968 and are Class C.