On average, listings lease in the $20's per square foot per year. The Harlingen submarket is going through a a rise in rates. In the last 3 months, the median rate rose $3 per sqft per year. That's a 16% rise in rent.
In the last 90 days, 3 listings have been posted online, which means new listings most likley are going fast. You'll want to be prepared to tour spaces as quick as possible. There aren't many listings below 2,000 square feet posted, so finding a space for a small business might be tough.
Even though the median size is 15,000 sqft, there are still 0 office spaces below 2,000 sqft. Most buildings in this market are approximately 2 stories. Most buildings in this market were built in 1997 and are Class A.