Most listings are in the $20's per square foot per year. The Greater Pittsburgh region is going through a an increase in rates. In the last 3 months, the median rate went up $3 per sqft per year. That's a 10% rise in rent.
In the last 90 days, 631 listings have come on the market, so you'll want to check back regularly for new listings. About 4% of the listings in the Greater Pittsburgh are subleases, so you will probably need to consider the implications of signing a direct lease with the building. There aren't many listings below 2,000 square feet posted, so finding a space for a small business might be tough.
Even though the median size is 4,470 sqft, there are still 0 new listings below 2,000 sqft. Most properties in this market are approximately 3 floors. Most buildings in this area were built in 1984 and are Class B.