On average, listings lease in the $20's per square foot per year. The Aspinwall submarket is experiencing a an increase in rates. In the last 3 months, the median rate went up $26 per sqft per year.
In the last 90 days, 0 listings have been posted online, which means spaces are probably going fast. You'll want to be prepared to make an offer immediately. About Inf% of the available space in the Aspinwall 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 posted, so finding a space for a small business might be tough.
The standard measurement for office space in this area is around 2,110 sqft. Most properties in this market are around 2 floors.