On average, listings lease in the $10's per square foot per year. The Garland submarket is going through a a boost in rates. In the last 3 months, the median rate increased $18 per sqft per year. That's a Inf% rise in rent.
Compared to the rest of the DFW Metroplex market, the Garland submarket has lower rates, so you should have no trouble finding a great deal in this depreciated submarket.
In the last 90 days, 3 listings have been posted online, which means listings might be leasing quickly. You'll want to be prepared to make an offer immediately. 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 2,320 sqft. Most properties in this region are approximately 1 floors. Most buildings in this area were built in 1981 and are Class B.