The typical asking rate per listing is in the $20's per square foot per year. The Southlake region is seeing a decline in rates. In the last 3 months, the median rate decreased $1 per sqft per year. That's a 2% decline in rent.
Compared to the rest of the DFW Metroplex market, the Southlake region has greater rates, and you'll need to pay a premium to be in this hot region.
In the last 90 days, 27 listings have come on the market, which means listings most likley are going fast. You'll want to be prepared to make an offer immediately. About 4% of the office spaces in the Southlake 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 2,230 sqft. Most buildings in this market are close to 1 stories. Most buildings in this market were built in 2003 and are Class A.