In the last 90 days, 1 listings have come on the market, which means leases are probably going fast. You'll want to be prepared to make an offer immediately. About 100% of the available leases in the Mont Belvieu 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 posted, so finding a space for a small business might be tough.
The standard measurement for office space in this area is around sqft.