Boston's Three-Deckers: The Beauty And The Blight
"In Krims history, there were many builders who went bankrupt, as the production of three-deckers all but came to a stop around 1930. Real estate consultant John Anderson points to another factor: a 1929 change in zoning, which discouraged three-deckers by imposing new requirements for depth and frontage. By the time the building was over, three-deckers had practically defined the texture of a whole city. Even in 1970, the Boston Redevelopment Authority reported, one-to-four family homeschiefly three-deckersaccounted for three-fifths of the citys housing stock."
Thanks to Joshuah Mello