Most listings are in the $20's per square foot per year. The Pharr submarket is going through a a boost in rates. In the last 3 months, the median rate increased $29 per sqft per year.
In the last 90 days, 1 listings have been posted online, which means office spaces might be leasing quickly. You'll want to be prepared to make an offer immediately. 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 1,570 sqft. Most properties in this area are close to 3 floors. Most buildings in this region were built in 2014 and are Class B.