505 Beacon was designed by Carl Fehmer, architect, and built in 1888 by David Connery & Co., masons and builders, for D. Lewis, who is shown as the owner on the original building permit application, dated April 4, 1888, and on the final building inspection report, dated November 24, 1888.
By the 1889-1890 winter season, 505 Beacon was the home of insurance dealer Frank Eliot Sweetser and his wife, Susan Jameson (Anderson) Sweetser. They previously had lived in Charlestown. He is shown as the owner of 505 Beacon on the 1895 Bromley map.
They continued to live at 505 Beacon during the 1895-1896 winter season, but moved thereafter to Brookline.
In late 1895. 505 Beacon was purchased from Frank Sweetser by Dr. Francis Henry Williams and his wife, Anna Dunn (Phillips) Williams. The transaction was reported in the Boston Globe on December 3, 1895. They previously had lived at 23 Marlborough. Anna P. Williams is shown as the owner of 505 Beacon on the 1898, 1908, 1917, and 1928 Bromley maps. They also maintained a summer home in Tamworth, New Hampshire.
Francis H. Williams was a physician and a pioneer in the use of x-rays and radiation for both diagnostic and therapy purposes. He maintained his office at 505 Beacon.
Anna Williams died in April of 1933. Francis Williams continued to live at 505 Beacon until his death in June of 1936.
When she died, Anna Williams had named Atlanta University as a residual legatee of her estate, establishing a permanent fund in memory of her parents, John Charles Phillips and Harriet (Welch) Phillips. Among the assets inherited by the University was 505 Beacon.
In late 1936, Atlanta University sold 505 Beacon to Henry C. Brookings. The transaction was reported in the Boston Globe on January 5, 1937.
By 1937, 505 Beacon was owned by Albert Crittendon Kelley, a civil engineer and surveyor, and his wife. Elsie A. (Johnson) Kelley. They previously had lived in Harwichport. A. C. and E. J. Kelley are shown as the owners on the 1938 Bromley map.
In December of 1937, he filed for (and subsequently received) permission to convert 505 Beacon into a lodging house.
The Kelleys continued to live at 505 Beacon and operate it as a lodging house until 1947.
In 1947, 505 Beacon became the home of Frederick G. Chase and his wife, Evangeline (Cooper) Fellowes Chase. They previously had lived at 40 Tremont. They continued to operate 505 Beacon as a lodging house.
Frederick Chase was a stockman with the General Supply Company and later a plumber.
The Chases either separated or Evangeline Chase died, inasmuch as she no longer was listed at 505 Beacon after 1950. Frederick Chase continued to live at 505 Beacon and operate it as a lodging house until his death in 1964.
In September of 1965, 505 Beacon was acquired by real estate dealer Franklyn G. Bill and Sidney R. Handler, trustees of the C and S Realty Trust. They continued to operate it as a lodging house. They already owned 507 Beacon which they also operated as a lodging house.
In September of 2008, the C and S Realty Trust transferred 505 Beacon to the 505 Beacon LLC and 507 Beacon to the 507 Beacon LLC.
505 Beacon continued to be a lodging house in 2014.