On average, listings lease in the $20's per square foot per year. The Farmers Branch submarket is going through a an increase in rates. In the last 3 months, the median rate rose $0 per sqft per year. That's a 0% rise in rent.
Compared to the rest of the DFW Metroplex market, the Farmers Branch submarket has smaller rates, so you should have no trouble finding a great deal in this depreciated submarket.
In the last 90 days, 381 listings have been made available, so you'll want to check back regularly for new listings. About 55% of the listings in the Farmers Branch are subleases, so you might be able to sign a shorter term by taking over a previous lease. 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 830 sqft. Most properties in this region are around 4 stories. Most buildings in this market were built in 1982 and are Class A.