Most listings are in the $20's per square foot per year. The Bexar County region is going through a decline in rates. In the last 3 months, the median rate fell $2 per sqft per year. That's a 7% decrease in rent.
Compared to the rest of the Greater Austin market, the Bexar County region has lower rates, so you should have no trouble finding a great deal in this discounted submarket.
In the last 90 days, 712 listings have been posted online, so you'll want to check back regularly for new listings. About 46% of the available leases in the Bexar County are subleases, so you might be able to snag a great spot on a short term. 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 2,350 sqft. Most buildings in this area are around 2 floors. Most buildings in this market were built in 1985 and are Class A.