Boston’s most expensive two-bedroom apartments are clustered in two areas

Nine of Boston’s 10 most expensive two-bedroom apartments for sale are located in Downtown Crossing and Back Bay, with one in Beacon Hill, according to an analysis of market-rate listings from real estate research site NeighborhoodX.

These 10 range in price from $3.2 million for a 2,290-square-footer in 215 Commonwealth Avenue to $5.25 million for a 2,435-square-foot condo at the Mandarin Oriental (it’s pictured above).

“The high prices are driven by two factors—not only higher prices per square foot, but a lot more square feet in general,” NeighborhoodX research director Constantine Valhouli said in an email.

Yes, these are big places—as big as a Victorian-like 3,323 square feet. See the interactive chart below for more details.