On average, listings lease in the $10's per square foot per year. The Westmoreland County submarket is going through a a boost in rates. In the last 3 months, the median rate increased $3 per sqft per year. That's a 17% rise in rent.
In the last 90 days, 23 listings have come on the market, which means listings are probably leasing quickly. You'll want to be prepared to make an offer immediately. About 4% of the available leases in the Westmoreland County 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 available, 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 buildings in this area are around 2 stories. Most buildings in this region were built in 1990 and are Class B.