On average, listings lease in the $20's per square foot per year. The Westlake region is going through a a rise in rates. In the last 3 months, the median rate went up $24 per sqft per year.
In the last 90 days, 8 listings have been listed, which means new availabilities are probably going fast. You'll want to be prepared to make an offer immediately. About 75% of the available leases in the Westlake 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 2,590 sqft, there are still 0 leases below 2,000 sqft. Most buildings in this market are around 2 stories. Most buildings in this area were built in 1990 and are Class A.