The typical asking rate per listing is in the $20's per square foot per year. The San Antonio submarket 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 3% rise in rent.
Compared to the rest of the San Antonio market, the San Antonio region has lower rates, so you should have no trouble finding a great deal in this undervalued region.
In the last 90 days, 639 listings have been made available, so you'll want to check back regularly for new listings. About 2% of the office spaces in the San Antonio 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 available, so finding a space for a small business might be tough.
The standard measurement for office space in this area is around 2,180 sqft. Most buildings in this region are close to 2 stories. Most buildings in this market were built in 1985 and are Class A.