Boston’s Boylston Street ranks as the eighth most expensive roadway for commercial real estate in the country, according to a study by Jones Lang LaSalle.

While the Back Bay boulevard’s average $52.65 a square-foot rents gained it a spot in the nation’s top 10 priciest commercial streets, that number is eclipsed by California’s Sand Hill Road in Menlo Park, where the techie epicenter of the world commands $114 per square-foot, on average.

Sand Hill Road, in the heart of Silicon Valley, houses many of the venture capitalists that provide start-ups with funding to grow and spread the tech expansion, so it’s no surprise that the deepest pockets around would be required to pay the highest prices around. But the commercial real estate industry in Boston isn’t too shabby either.

"The Back Bay with Boylston Street at its core continues to display the strongest fundamentals of all downtown Boston submarkets," said William Motley, JLL managing director in Boston.

"Vacancy rates continue to climb although it does remain off of the peak pricing levels of 2008."

Rents on other iconic streets, like Fifth Avenue in New York City, run at $97 a square-foot, landing second place on the list. And Greenwich Avenue in Greenwich, Conn., ranked third at $90 per square-foot.

"Rents for office space in these streets were almost 90 percent higher than the average rents in the same metropolitan area," said John Sikaitis, Senior Vice President of Research at Jones Lang LaSalle. "Location is everything in real estate and this study proves it.  Despite economic conditions, demand for these prime and often prestigious addresses continues to be high."