Most listings are in the $20's per square foot per year. The Lewisville region is seeing a a boost in rates. In the last 3 months, the median rate increased $25 per sqft per year.
Compared to the rest of the DFW Metroplex market, the Lewisville region has less expensive rates, so you should have no trouble finding a great deal in this undervalued region.
In the last 90 days, 11 listings have come on the market, which means spaces most likley are leasing quickly. You'll want to be prepared to tour spaces as quick as possible. About 18% of the available leases in the Lewisville are subleases, so you might be able to snag a great spot on a short term. There aren't many listings below 2,000 square feet posted, so finding a space for a small business might be tough.
The standard measurement for office space in this area is around 2,100 sqft. Most properties in this market are close to 1 floors. Most buildings in this region were built in 2000 and are Class B.