Credit: Skanska

According to CoStar there are 20 Class A properties that can offer 50,000 square feet or more of contiguous office space in the Seaport, Back Bay or the Financial District (see full chart below).

From the Boston Globe:

Despite Boston’s development boom, big chunks of office space are scarce right now. As of Oct. 1, there were 17 tenants looking for 50,000 square feet or more of top-end office space in downtown Boston, according to real estate firm JLL, and just 11 blocks big enough to house them. That means buildings with room are drawing interest.

Three would-be tenants have proposed leasing all 180,000 square feet that Boston Properties has at 120 St. James, in the base of the old John Hancock Tower, president Douglas Linde told analysts recently. The space PWC left behind for the Seaport, at 125 High Street, also went quick. And Goodwin Procter’s soon-to-be-former home at 53 State has seen strong interest.

One addition to that list may soon be Skanska, offering “brand-new space with all the bells and whistles.”