300 Commonwealth was designed by architect Obed F. Smith and built in 1880-1881 for Uriah H. Coffin, a building contractor, probably for speculative sale, one of two contiguous houses (300-302 Commonwealth). Uriah Coffin is shown as the owner on the original building permit applications, dated September 13, 1880 (for 300 Commonwealth) and November 11, 1881 (for 302 Commonwealth, with a notation that the plans are duplicate of 300 Commonwealth), and as the owner of both houses on the 1883 Bromley map.
By the 1886-1887 winter season, 300 Commonwealth was the home of stockbroker John Howard Brown and his wife, Josephine P. (Appleton) Brown. They previously had lived at 171 West Newton. Josephine P. Brown is shown as the owner of 300 Commonwealth on the 1888, 1898, and 1908 Bromley maps.
J. Howard Brown died in February of 1897. Josephine Brown continued to live at 300 Commonwealth. Her sister, Mrs. Myra A. Porter, the widow of William Porter, lived with her at the time of the 1900 US Census.
Josephine Brown continued to live at 300 Commonwealth in 1910, but had moved to 636 Beacon by 1911.
In the fall of 1910, 300 Commonwealth was purchased from Josephine Brown by Charles Orville Whitten and his wife, Grace Evelyn (Knight) Whitten. The transaction was reported in the Boston Globe on November 1, 1910. They previously had lived in an apartment at 295 Commonwealth. They also maintained a home in North Sudbury. Grace E. Whitten is shown as the owner of 300 Commonwealth on the 1912 and 1917 Bromley maps.
Charles Whitten was a gelatin and glue manufacturer.
They continued to live there in 1923, but by 1924 had made Marblehead and Palm Beach, Florida, their homes.
In mid-1923, 300 Commonwealth was purchased from the Whittens by John Wesley Linnell and his wife, Mary Fairfield (Robinson) Linnell. The transaction was reported in the Boston Globe on June 14, 1923. They previously had lived in Brookline (in 1923), and at 15 Bay State Road (at the time of the 1920 US Census). Mary F. Linnell is shown as the owner of 300 Commonwealth on the 1928 and 1938 Bromley maps.
A former stockbroker, John Linnell was president of the Massachusetts Consolidated Mining Company.
In the fall of 1949, Dr. George J. Colantino, a physician, purchased 300 Commonwealth from the estate of Mary Linnell. The transaction was reported in the Boston Globe on October 30, 1949. In November of 1949, he filed for (and subsequently received) permission to convert the property from a single-family dwelling into a three-family dwelling.
George Colantino and his wife, Edith E. (Fitzgerald) Colantino, lived in one of the apartments at 300 Commonwealth. He also maintained his medical office there. They previously had lived in Medford. They continued to live at 300 Commonwealth in 1953, but had moved to 404 Beacon by 1954.
By 1950, one of the other apartments was occupied by Toba Esther Finn (Tresa E. (Finkelstein) Friedman), the former wife of Julian Friedman, credit manager of Morris Gordon & Son, hotel and restaurant equipment dealers. She previously had lived in an apartment at 256 Beacon. She continued to live at 300 Commonwealth in 1954, but had purchased and moved to 317 Beacon by 1955.
By 1954, 300 Commonwealth was the home and medical office of Dr. Juanita P. Johns, a physician. She probably lived in the apartment previously occupied by the Colantinos. In 1953, she had lived and maintained her offices at 313 Commonwealth.
She continued to live and maintain her medical office at 300 Commonwealth in 1958, but had moved to an apartment at 46 Commonwealth by 1959.
By 1960, 300 Commonwealth was the home of Benjamin Harrison Brightman and his wife, Doris (Cooperman) Lubarsky Brightman. He was a sales manager. They continued to lived there in 1972.
The property changed hands and in June of 1995 was purchased by Thomas W. Blumenthal and his wife, Lisa (Achki) Blumenthal. In April of 1996, he filed for (and subsequently received) permission to convert the property from a three-family dwelling into a two-family dwelling. And in September of 2001, he filed for (and subsequently received) permission to convert the property into a single-family dwelling.
300 Commonwealth a single-family dwelling in 2015.