|The following is based on Fallout 4 cut content.|
In the documentary The History of Bethesda Game Studios, there is a map of the Commonwealth which shows Vault 117 just north of Jamaica Plain. There is also concept art of a Vault 117 jumpsuit in the Art of Fallout 4.
Vault 88 was added due south of the nearby Jamaica Plain.
Vault 117 was cut from Fallout 4.