On average, listings lease in the $10's per square foot per year. The Brent region is seeing a a rise in rates. In the last 3 months, the median rate rose $0 per sqft per year. That's a 1% rise in rent.
In the last 90 days, 11 listings have been posted online, which means new availabilities are probably going fast. You'll want to be prepared to make an offer immediately. 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 640 sqft. Most properties in this region are close to 1 stories. Most buildings in this area were built in 1975 and are Class Class C.