The typical asking rate per listing is in the $10's per square foot per year. The Twain submarket is experiencing a a boost in rates. In the last 3 months, the median rate went up $19 per sqft per year.
In the last 90 days, 8 listings have been listed, which means new availabilities are probably going fast. You'll want to be prepared to make an offer immediately. About 63% of the listings in the Twain are subleases, so you might be able to find a shorter term or below market rent. 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 1,190 sqft. Most buildings in this region are around 2 floors. Most buildings in this area were built in 1978.