Most listings are in the $20's per square foot per year. The Heathrow region is experiencing a decrease in rates. In the last 3 months, the median rate decreased $3 per sqft per year. That's a 10% decline in rent.
In the last 90 days, 3 listings have been posted online, which means office spaces most likley are going fast. You'll want to be prepared to make an offer immediately. About 133% of the office spaces in the Heathrow are subleases, so you might be able to sign a shorter term by taking over a previous lease. There aren't many listings below 2,000 square feet on the market, so finding a space for a small business might be tough.
Even though the median size is 6,700 sqft, there are still 0 new listings below 2,000 sqft. Most buildings in this market are close to 3 stories. Most buildings in this market were built in 1997 and are Class A.