Most listings are in the $20's per square foot per year. The Aspinwall region is going through 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 come on the market, which means spaces most likley are leasing quickly. You'll want to be prepared to make an offer immediately. About NaN% of the office spaces in the Aspinwall are subleases, so you will probably have to consider a longer term 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 2,110 sqft. Most buildings in this region are around 2 stories.