On average, listings lease in the $10's per square foot per year. The La Porte region is going through a decline in rates. In the last 3 months, the median rate fell $5 per sqft per year. That's a 25% decline in rent.
In the last 90 days, 5 listings have been posted online, which means spaces most likley are leasing quickly. You'll want to be prepared to tour spaces as quick as possible. 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 2,290 sqft. Most buildings in this area are around 2 stories. Most buildings in this region were built in 1914 and are Class B.