Commonwealth Ave. duplex with 11 rooms, elliptical staircase drops for $11.25M

The 11-room, seven-fireplace Unit 3 at 257 Commonwealth Avenue in Back Bay unfolds in gloriously colorful fashion over the parlor and second floors of the circa 1886 building.

An elliptical staircase connects the two levels (though there’s also an elevator), and a 900-square-foot private deck comes included in the price as do two parking spaces.

What is that price? A stonking $11,250,000 through Marsh Properties, which sets up Unit 3 to be one of the more expensive deals in Boston all year—and 2017 has seen some huge deals thus far. Stay tuned.

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