Most listings are in the $20's per square foot per year. The Heathrow submarket is going through a decline in rates. In the last 3 months, the median rate fell $5 per sqft per year. That's a 16% decline in rent.
In the last 90 days, 5 listings have been listed, which means office spaces are probably leasing quickly. 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.
Even though the median size is 3,330 sqft, there are still 0 office spaces below 2,000 sqft. Most buildings in this region are approximately 3 floors. Most buildings in this area were built in 1997 and are Class A.