Simonson, Sharon (19 de agosto de 2013). «Yelp Occupies 140 New Montgomery». TheRegistrySF.com(en inglés estadounidense). Consultado el 2 de enero de 2019.
Poletti, Therese (7 de marzo de 2012). «New Call by Developer on Historic Tower». The Wall Street Journal(en inglés estadounidense). Consultado el 9 de diciembre de 2012. «A historic skyscraper in downtown San Francisco, the Pacific Telephone & Telegraph building, empty for almost six years, is about to become a hub of construction activity as a US$50 million–plus modernization project begins. ... This is a new strategy from the developer, which in 2008 filed plans to turn the tower, also known as the Telephone Building, into 118 luxury condominiums, at an estimated cost of US$80 million to US$100 million.»
