The construction in 1885 of the massive John Adams Courthouse changed the scale and character of the square, as did the Center Plaza building in the 1960s.
In the mid-1830s land on Cotton Hill (also called Pemberton Hill) between Tremont Street and Somerset Street was developed as Phillips Place, "laid out on the estates late of the heirs of Messrs. [Jonathan] Phillips, [Gardiner] Greene, and [James] Lloyd.
Jackson ... cut down the top of Pemberton Hill in order to create a desirable residential area halfway down the slope, at the point where the mansion had stood.
The two squares sat very near one another, with Pemberton set back from Scollay, and accessed by a short connecting street.
"[6] "In the middle of the square [was] an enclosed green, with a few trees, which ... was a pleasant bit of nature for the eye of the city man to rest upon.
"[6] During the city's Water Celebration in 1848, "the cavalcade [passed] up Park, down Beacon and Somerset Street, to Pemberton Square.