Most listings are in the $20's per square foot per year. The Bexar County region is going through a an increase in rates. In the last 3 months, the median rate went up $1 per sqft per year. That's a 6% increase in rent.
Compared to the rest of the Greater Austin market, the Bexar County region has smaller rates, so you should have no trouble finding a great deal in this undervalued region.
In the last 90 days, 712 listings have been posted online, so you'll want to check back regularly for new listings. About 2% of the office spaces in the Bexar County are subleases, so you will probably need to sign a longer term lease with the landlord directly. There aren't many listings below 2,000 square feet on the market, so finding a space for a small business might be tough.
The standard measurement for office space in this area is around 2,195 sqft. Most properties in this area are close to 2 stories. Most buildings in this region were built in 1985 and are Class A.