The Trident Apartments in New Rochelle were built in two phases, the first in 1911-1912. How do we know when the building opened? The New Rochelle Pioneer ran a pleasant little item called “Hello People” that reported the name of every new subscriber to the phone company. The June 1 edition of 1912 welcomed the Trident Apartment.
Frederick Mathesius, who would run the Trident Realty Co. for decades, was already involved with the company by at least 1912, so it makes sense to assume that he was the architect. He did not join Rich’s firm until 1913.
The side facade of the building’s 1920 second phase, above, looks a bit like the side facade of South Fayerweather Hall at Dartmouth (1906), below: