In June 1856, Addison vetoed a second installment of payments for the railroad, which effectively cancelled the project.

[5] During his time as mayor, Addison called for a discussion on retrocession, but opinion was divided.

[2] Addison died on January 3, 1870, at his home on the corner of Dunbarton and Montgomery Street.

In 2020, the DC Facilities and Commemorative Expressions Working Group committee recommended that both Addison and Hyde should have their names removed from the building.

A news article noted that Addison was an enslaver, according to U.S. Census records.