The typical asking rate per listing is in the $10's per square foot per year. The Brent region is going through a a rise in rates. In the last 3 months, the median rate rose $1 per sqft per year. That's a 7% rise in rent.
In the last 90 days, 8 listings have been posted online, which means new availabilities might be going fast. 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 640 sqft. Most properties in this region are approximately 1 floors. Most buildings in this market were built in 1975 and are Class Class C.