Most listings are in the $10's per square foot per year. The Twain submarket is going through a decrease in rates. In the last 3 months, the median rate fell $1 per sqft per year. That's a 3% decrease in rent.
In the last 90 days, 8 listings have been listed, which means leases are probably leasing quickly. You'll want to be prepared to tour spaces as quick as possible. About 13% of the office spaces in the Twain 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 2,000 sqft. Most properties in this region are approximately 2 floors. Most buildings in this market were built in 1989.