Most listings are in the $20's per square foot per year. The McAllen region is experiencing a a rise in rates. In the last 3 months, the median rate increased $26 per sqft per year.
In the last 90 days, 33 listings have been posted online, which means spaces most likley are going fast. You'll want to be prepared to tour spaces as quick as possible. About 70% of the listings in the McAllen are subleases, so you might be able to find a shorter term or below market rent. There aren't many listings below 2,000 square feet available, so finding a space for a small business might be tough.
Even though the median size is 3,250 sqft, there are still 0 listings below 2,000 sqft. Most buildings in this market are around 1 floors. Most buildings in this region were built in 2003 and are Class B.